<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>a2100864zsc13ga.txt
<DESCRIPTION>SCHEDULE 13G/A
<TEXT>
<PAGE>

---------------------                                          -----------------
CUSIP NO. 84842R106                     13G                    PAGE 1 OF 8 PAGES
---------------------                                          -----------------


                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                ----------------

                                 SCHEDULE 13G/A
                                (Amendment No. 4)
                    Under the Securities Exchange Act of 1934

                            SPHERIX INCORPORATED
                      (formerly Biospherics Incorporated)
              ----------------------------------------------------
                                (Name of Issuer)


                          COMMON STOCK, $.005 PAR VALUE
              ----------------------------------------------------
                         (Title of Class of Securities)

                                    84842R106
              ----------------------------------------------------
                                 (CUSIP Number)

                              Gerald F. Stahlecker
                     c/o Rose Glen Capital Management, L.P.
                          3 Bala Plaza East, Suite 501
                               251 St. Asaphs Road
                              Bala Cynwyd, PA 19004


                                DECEMBER 31, 2002
              -----------------------------------------------------
              Date of Event Which Requires Filing of this Statement


Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

|_|  Rule 13d-1(b)
|X|  Rule 13d-1(c)
|_|  Rule 13d-1(d)


<PAGE>

---------------------                                          -----------------
CUSIP NO. 84842R106                     13G                    PAGE 2 OF 8 PAGES
---------------------                                          -----------------

--------------------------------------------------------------------------------
 1      NAME OF REPORTING PERSON/
        I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (Entities Only)

        RGC International Investors, LDC
--------------------------------------------------------------------------------
 2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP       (a)|_|
                                                              (b)|_|
--------------------------------------------------------------------------------
 3     SEC USE ONLY
--------------------------------------------------------------------------------
 4     CITIZENSHIP OR PLACE OF ORGANIZATION

       Cayman Islands
--------------------------------------------------------------------------------
                        5 SOLE VOTING POWER

       Number of          0
       Shares           --------------------------------------------------------
       Beneficially     6 SHARED VOTING POWER
       Owned by
       Each               1,085,973
       Reporting        --------------------------------------------------------
       Person           7 SOLE DISPOSITIVE POWER
       With
                          0
                        --------------------------------------------------------
                        8 SHARED DISPOSITIVE POWER

                          1,085,973
--------------------------------------------------------------------------------
 9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       1,085,973
--------------------------------------------------------------------------------
 10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
       CERTAIN SHARES
                                                            |_|

--------------------------------------------------------------------------------
 11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       8.75%
--------------------------------------------------------------------------------
 12    TYPE OF REPORTING PERSON

       00
--------------------------------------------------------------------------------

                                        2
<PAGE>

---------------------                                          -----------------
CUSIP NO. 84842R106                     13G                    PAGE 3 OF 8 PAGES
---------------------                                          -----------------



--------------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON/
       I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (Entities Only)

       Rose Glen Capital Management, L.P.
--------------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP              (a)|_|
                                                                     (b)|_|
--------------------------------------------------------------------------------
  3    SEC USE ONLY

--------------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

       Delaware
--------------------------------------------------------------------------------
                        5 SOLE VOTING POWER

       Number of          0
       Shares           --------------------------------------------------------
       Beneficially     6 SHARED VOTING POWER
       Owned by
       Each               1,085,973
       Reporting        --------------------------------------------------------
       Person           7 SOLE DISPOSITIVE POWER
       With
                          0
                        --------------------------------------------------------
                        8 SHARED DISPOSITIVE POWER

                          1,085,973
--------------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
       REPORTING PERSON

       1,085,973
--------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
       CERTAIN SHARES
                                                              |_|

--------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       8.75%
--------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON

       PN
--------------------------------------------------------------------------------

                                        3
<PAGE>


---------------------                                          -----------------
CUSIP NO. 84842R106                     13G                    PAGE 4 OF 8 PAGES
---------------------                                          -----------------



--------------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON/
       I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (Entities Only)

       RGC General Partner Corp.
--------------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP            (a)|_|
                                                                   (b)|_|
--------------------------------------------------------------------------------
  3    SEC USE ONLY

--------------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

       Delaware
--------------------------------------------------------------------------------
                        5 SOLE VOTING POWER

       Number of          0
       Shares           --------------------------------------------------------
       Beneficially     6 SHARED VOTING POWER
       Owned by
       Each               1,085,973
       Reporting        --------------------------------------------------------
       Person           7 SOLE DISPOSITIVE POWER
       With
                          0
                        --------------------------------------------------------
                        8 SHARED DISPOSITIVE POWER

                          1,085,973
--------------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
       PERSON

       1,085,973
--------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
       SHARES
                                                             |_|

--------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       8.75%
--------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON

       CO
--------------------------------------------------------------------------------

                                        4

<PAGE>

---------------------                                          -----------------
CUSIP NO. 84842R106                     13G                    PAGE 5 OF 8 PAGES
---------------------                                          -----------------



ITEM 1(a).  NAME OF ISSUER:

            Spherix Incorporated (formerly Biospherics Incorporated) ("Issuer")

ITEM 1(b).  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

            12501 Indian Creek Court
            Beltsville, Maryland 20705

ITEM 2(a).  NAME OF PERSON FILING
ITEM 2(b).  ADDRESS OF PRINCIPAL BUSINESS OFFICE
ITEM 2(c).  CITIZENSHIP:

            RGC International Investors,LDC ("RGC")
            c/o SEI Fund Resources International, Ltd.
            Styne House, Upper Hatch Street
            Dublin 2 Ireland
            Cayman Islands limited duration company

            Rose Glen Capital Management, L.P. ("Rose Glen")
            3 Bala Plaza East, Suite 501
            251 St. Asaphs Road
            Bala Cynwyd, Pennsylvania 19004
            Delaware limited partnership

            RGC General Partner Corp. ("Partner")
            3 Bala Plaza East, Suite 501
            251 St. Asaphs Road
            Bala Cynwyd, Pennsylvania 19004
            Delaware corporation

            RGC is a private investment fund. Rose Glen is the investment
            manager of RGC, and Partner is the general partner of Rose Glen.

ITEM 2(d).  TITLE OF CLASS OF SECURITIES:
            Common Stock, par value $.005 per share (the
            "Common Stock").

ITEM 2(e).  CUSIP NUMBER:

            84842R106

ITEM 3.     IF THIS STATEMENT IS FILED PURSUANT TO RULE 13D-1(b),OR 13D-2(b)
            OR (c), CHECK WHETHER THE PERSON FILING IS A:

            Not Applicable.

            IF THIS STATEMENT IS FILED PURSUANT TO RULE 13D-1(c),
            CHECK THIS BOX. |X|


                                        5

<PAGE>

---------------------                                          -----------------
CUSIP NO. 84842R106                     13G                    PAGE 6 OF 8 PAGES
---------------------                                          -----------------


ITEM 4.     OWNERSHIP.

            (a) Amount beneficially owned:

                1,085,973 shares of Common Stock (1)

            (b) Percent of Class:

                Approximately 8.75% as of the date of filing this
                statement. (Based on 11,330,432 shares of Common
                Stock issued and outstanding as of October 25,
                2002 per the Issuer's Quarterly Report on Form 10-Q
                for the quarterly period ended September 30, 2002.) (1)

            (c) Number of shares as to which such persons have:

                (i)   Sole power to vote or to direct the vote:

                      0

                (ii)  Shared power to vote or to direct the vote:

                      See Item 4(a) above.

                (iii) Sole power to dispose or to direct the disposition of:

                      0

                (iv)  Shared power to dispose or to direct the
                      disposition of:

                      See Item 4(a) above.

--------------

(1)  The beneficial ownership reported herein represents 8.75% of the
     outstanding Common Stock on December 31, 2002 and consists of
     1,085,973 shares of Common Stock that are currently issuable within
     60 days of December 31, 2002 upon exercise of a Warrant. The Warrant
     expires on February 24, 2004.

     The terms of the Warrant provide that the Warrant is exercisable on any
     given date only to the extent that the number of shares of Common Stock
     then issuable upon exercise of the Warrant, together with any other shares
     of Common Stock beneficially owned by the Reporting Persons or any of their
     affiliates (excluding for this purpose shares of Common Stock which may be
     deemed beneficially owned through the ownership of the unexercised
     Warrant) would not exceed 9.9% of the Common Stock then issued and
     outstanding. Accordingly, the Reporting Persons' ability to fully exercise
     the Warrant may be limited by the terms of the Warrant.


                                        6
<PAGE>


---------------------                                          -----------------
CUSIP NO. 84842R106                     13G                    PAGE 7 OF 8 PAGES
---------------------                                          -----------------



ITEM 5.  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

         Not Applicable.

ITEM 6.  OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER
         PERSON.

         RGC has granted to Rose Glen, as investment manager, the sole
         power to manage RGC's investments.

ITEM 7.  IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
         THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.

         Not Applicable.

ITEM 8.  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

         Not Applicable.

ITEM 9.  NOTICE OF DISSOLUTION OF GROUP.

         Not Applicable.

                                        7

<PAGE>

---------------------                                          -----------------
CUSIP NO. 84842R106                     13G                    PAGE 8 OF 8 PAGES
---------------------                                          -----------------



ITEM 10. CERTIFICATIONS.

         By signing below I certify that, to the best of my knowledge
         and belief, the securities referred to above were not acquired
         and are not held for the purpose of or with the effect of
         changing or influencing the control of the issuer of the
         securities and were not acquired and are not held in connection
         with or as a participant in any transaction having that purpose
         or effect.

                                 SIGNATURES

              After reasonable inquiry and to the best of my knowledge and
         belief, I certify that the information set forth in this
         statement is true, complete and correct.

                                      RGC International Investors, LDC
                                      By: Rose Glen Capital Management, L.P.
                                      By: RGC General Partner Corp.


Dated: January 16, 2003               By: /s/ GERALD F. STAHLECKER
                                          ------------------------
                                          Gerald F. Stahlecker
                                          Managing Director

                                      Rose Glen Capital Management, L.P.
                                      By: RGC General Partner Corp.


Dated: January 16, 2003               By: /s/ GERALD F. STAHLECKER
                                          ------------------------
                                          Gerald F. Stahlecker
                                          Managing Director


                                      RGC General Partner Corp.

Dated: January 16, 2003               By: /s/ GERALD F. STAHLECKER
                                          ------------------------
                                          Gerald F. Stahlecker
                                          Managing Director


                                        8
<PAGE>
                                                                       EXHIBIT A

                             JOINT FILING AGREEMENT

     In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of
1934, as amended, the undersigned hereby agree to the joint filing with all
other Reporting Persons (as such term is used in the Schedule 13G/A referred to
below) on behalf of each of them of a statement on Schedule 13G/A (including
amendments thereto) with respect to the Common Stock, par value $.005 per share,
of Spherix Incorporated, and that this Agreement be included as an exhibit
to such joint filing. This Agreement may be executed in any number of
counterparts all of which taken together shall constitute one and the same
instrument.

     IN WITNESS WHEREOF, the undersigned hereby execute this Agreement this 16th
day of January 2003.

                                      RGC International Investors,LDC
                                      By: Rose Glen Capital Management, L.P.
                                      By: RGC General Partner Crp.


Dated: January 16, 2003               By: /s/ GERALD F. STAHLECKER
                                          ------------------------
                                          Gerald F. Stahlecker
                                          Managing Director

                                      Rose Glen Capital Management, L.P.
                                      By: RGC General Partner Corp.


Dated: January 16, 2003               By: /s/ GERALD F. STAHLECKER
                                          ------------------------
                                          Gerald F. Stahlecker
                                          Managing Director


                                      RGC General Partner Corp.

Dated: January 16, 2003               By: /s/ GERALD F. STAHLECKER
                                          ------------------------
                                          Gerald F. Stahlecker
                                          Managing Director


                                        9

</TEXT>
</DOCUMENT>
