260 [November, 



Lymncea . Small and white ; rarely seen except in marl. 



Lymncea desidiosa, Say. Shores. 



Lymncea humilis, Say. Shores. 



Planorbis trivolvis, var. corpulentus, Say. Rarely seen. 



Planorhis campanulattis, Say. 



Planorbis bicarinaius, Say. Small and white. 



Planorbis hirsutus, Say. Borders of marshes. 



Planorbis deftectus, Say. Borders of marshes. 



Planorbis parvus, Say. Borders of marshes. 



Physa heterostropha, Say. 



Ancylus, two species. On rushes. 



Paludina decisa ? Say. Shell coated with a fine red pigment, very adherent ; 

 animal of a lighter color than any variety of decisa I have seen. 



Amnicola limosa, Say. 



Am. (Pal.) pallida ? Lea. (Small, acutely conic ;) rare. 



Valvata tricarinata, Say. 



Valvata, var. bicarinata, Lea. Runs into every change of carination that can 

 be supposed. Sometimes one, sometimes two of the carinje are absent. 



Valvata sincera, Say. Animal blue, seen through the shell, which is white 

 and translucent, while the shells of tricarinata, bicarinata and varieties are of 

 usual characteristic green. Shells smooth, polished. 



Valvata striata, Lewis. Undescribed. Shell conical, depressed, umbilicate, 

 aperture round ; epidermis brown and very regularly striate. Has all the other 

 features of sincera, except color and translucency. Animals not observed. Very 

 rarely seen. Of several hundred living specimens of Valvata, only seven were 

 of this species. These are all the aquatic species yet observed." 



Mr. Lea also read a letter from Thomas Biddle, Jr., Esq., U. S. Consul 

 at Singapore, dated August 21st, 1856, enclosing one from Prof. Oldham 

 of Calcutta, offering to exchange the publications of the Asiatic Society, 

 and of the Greological Society of British India, for those of the Academy. 

 Referred to the Publication Committee with power to act. 



November 11th. 

 Mr. Lea, Vice-President, in the Chair. 



A paper was presented^ for publication in the Proceedings, entitled 

 " Characters of an undescribed Bird, belonging to the genus Campylo- 

 rhynchus of Spix, with remarks upon other species of the same group. 

 By Philip Lutley Sclater, M. A." Referred to a committee consisting 

 of Dr. Wilson, Mr. Cassin and Col. MeCall. 



Mr. Cassin presented for publication in the Proceedings, a paper en- 

 titled "Birds of Southern Indiana, by Rufus Haymond." Referred to 

 Mr. Cassin, Dr. Wilson and Col. McCall. 



Dr. Leidy presented a paper for publication in the Proceedings, en- 

 titled '' Notice of remains of two species of Seal, by Joseph Leidy, 

 M. D." Referred to a Committee consisting of Dr. Bridges, Mr. Vaux, 

 and Dr. Hallowell. 



Dr. Leidy presented a paper for publication in the Proceedings, en- 

 titled " Descriptions of new^Fossil Species of MoUusca, collected by Dr. 

 F. V. Hayden, in Nebraska Territory, under the direction of Lieut. G. 

 K. Warren, of the U. S. Topographical Engineers, with a catologue of 

 all the remains hitherto described and identified from the Tertiary and 



