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ROPES & GRAY LLP ONE INTERNATIONAL PLACE BOSTON, MA 02110-2624 WWW.ROPESGRAY.COM |
| December 28, 2009 |
Mary E. Weber 617-951-7000 617-951-7050 fax Mary.Weber@ropesgray.com |
VIA EDGAR
Securities and Exchange Commission
Division of Corporation Finance
100 F Street, N.E.
Mail Stop 3030
Washington, D.C. 20549
| Attention: | Ms. Mary Beth Breslin |
| Mr. Jay Mumford |
| Re: | pSivida Corp. |
| Registration Statements on Form S-3 |
| Filed November 25, 2009 |
| File Nos. 333-163347 and 333-163349 |
Dear Ms. Breslin and Mr. Mumford,
On behalf of pSivida Corp., a Delaware corporation (the “Company”), we are writing with respect to:
| • | the Company’s Registration Statement on Form S-3, File No. 333-163347, filed on November 25, 2009 (the “Primary Registration Statement”), and relating to the Company’s registration of shares of its Common Stock, $0.001 par value per share (“Common Stock”), preferred stock, warrants and units; and |
| • | the Company’s Registration Statement on Form S-3, File No. 333-163349, filed on November 25, 2009 (together with the Primary Registration Statement, the “Registration Statements”), and relating to the Company’s registration of shares of its Common Stock underlying options and warrants. |
On behalf of the Company, we respectfully withdraw the prior requests for acceleration of the effective date of the Registration Statements.
Best regards,
/s/ Mary E. Weber
Mary E. Weber
| Cc: | Lori Freedman (pSivida Corp.) |