184-9.] 169 



March 6th, 1849. 

 Dr. Patterson in the Chair. 



Dr. Gambel read a continuation of his " Remarks on the Birds of 

 Upper California," intended for publication in the Journal. Referred 

 to Mr. Cassin, Dr. Wilson, and Dr. Townsend. 



Dr. Gambel also read a paper intended for publication in the Journal, 

 entitled, " Notes on the Pidgeons, with descriptions of new species," 

 which was referred to Mr. Cassin, Dr. Wilson, and Mr. Harris. 



Professor Agassiz made some remarks on the distinctions between 

 the fossil Crocodiles of the green sand of New Jersey, described by 

 Drs. Harlan and Morton, and characterized that of Dr. Harlan as a 

 distinct genus under the proposed name of Bottosaurus. 



March 13th, 1849. 

 Dr. Bridges in the Chair. 



Dr. Leidy presented a communication from Professor Haldeman, in- 

 tended for publication in the Proceedings, describing new species of 

 Cryptocephalus, &c., in the collection of Dr. J. L. Le Conte. Referred 

 to Drs. Zantzinger, Griffith, and Watson. 



Dr. Keller read a memoir entitled " On Ciliary cells of some marine 

 naked Mollusca, in embryo ;" which was referred to a committee con- 

 sisting of Drs. Leidy, Goddard, and Hallowell. 



Professor Agassiz made some observations upon the Crocodilus 

 clavirostris of Morton, and characterized it as a distinct genus under 

 the proposed name of Sphenosaurus. He also referred to the remains 

 of an immense fossil Chelonian, in the collection of the Academy, and 

 found in the green sand of New Jersey. Being allied to the Colosso- 

 chelys of India, Professor Agassiz proposed for it the name of 

 Atlaatochelys Mortoni. 



Dr. Leidv made some remarks on the intimate structure of the so- 

 called cartilages of the Cephalopoda, and pointed out their strong re- 

 semblance to bone. 



March 11th, 1849. 



Dr. Bridges in the Chair. 



The Committee to whom was referred Professor Haldeman's descrip- 

 tions of new species of CryptocepJialus, &.C., reported in favour of pub- 

 lication in the Proceedings. 



PROCEED. ACAD. NAT. SCI. OF PHILAEELPHIA. — VOL. IV. NO. VIII. 24 



