202 [December, 



December 5th. 

 Vice-President Bridges in the Chair. 



Letters were read 



From the Royal Academy of Sciences of Amsterdam, dated 7th Sept., 

 1854, accompanying their donations acknowledged this evening. 



From the City Library, Leipsic, dated 2d Oct., 1854, acknowledging 

 the receipt of the Proceedings of the Academy. 



From the New York State Library, dated 28th Nov., 1854, acknow- 

 ledging the receipt of the last number of the Proceedings. 



From Mr. John Landis, dated Hempfield, Penn., transmitting some 

 minerals from that vicinity, and requesting an examination thereof. 



From Prof. B. L. C. Wailes, dated Washington, Miss., acknowledging 

 the receipt of his notice of election as a Correspondent of the Academy. 



From Dr. Bennett Dowler, dated New Orleans, 1st Nov. 1854, trans- 

 mitting two specimens of foetal fishes, with a printed description of vi- 

 viparous fishes found in Louisiana. 



Dr. Leidy read a paper intended for publication, entitled, " Remarks 

 on the identity of Bootherium cavifrons with Ovibos moschatus, or 0. 

 maximus." Referred to Dr. Le Conte, Mr. Foulke, and Dr. Hallowell. 



Dr. Leidy exhibited a drawing of a species of Hydrachna, which he 

 had found in various conditions of development in the mantle of Unto 

 purpureus. They were very numerous, some specimens containing a 

 thousand or more. 



December 12th. 

 Vice-President Bridges in the Chair. 



A letter was read from Mr/ Eugene Borda, dated Minersville, Penn., 

 Dec. 1854, acknowledging the receipt of his notice of election as a 

 Member. 



Dr. Le Conte presented two papers for publication in the Proceedings, 

 severally entitled, " Descriptions of the species of Trox and Omorgus 

 inhabiting the United States/' and " Some corrections in the Nomencla- 

 ture of Coleoptera found in the United States;" both of which were 

 referred to Mr. Cassin, Dr. Zantzinger, and Prof. Baird. 



A paper from Mr. Girard, intended for publication, was presented, 

 entitled, ''Abstract of a report to Lieut J. M. Gilliss, U. S. N., upon 

 the Reptiles collected during the U. S. Naval Astronomical Expedition 

 to Chili." Referred to Dr. Hallowell, Mr. Lea ; and Major Le Conte. 



December 19 th. 

 Vice-President Bridges in the Chair. 



Letters were read 



From Lieut. G. H. Hare, dated Philadelphia, 19th Dec, 1854, trans- 

 mitting numerous donations to Museum acknowledged this evening. 

 The collections were made by Count Bernardi and himself. 



From Mr. S. S. Rathvon, dated Lancaster, Penn., 5th Dec, 1854, 

 acknowledging the receipt of his notice of election, as a Correspondent. 



