SECTION B.] NORTH AMERICAN CONCHOLOGT. 



555 



[Proceedings Academy of Natural Sc] 



April, 1856. 

 Vol. Pa. 



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L.ea. — Description of a new sub-genus of Naiades : by 

 Isaac Lea. 

 Plagiodon Lea (n. s. g.) 



isocardioides Lea. Rio Plata. 



L.ea. — Description of a new species of Triquetra Klein 

 (Hyria Lam.) : by Isaac Lea. 



Triquetra lanceolata Lea. 



China ? 



Lea. — Description of twenty-five new species of Exotic 

 Uniones : by Isaac Lea. 



Unio Hainesianus Lea, 

 Myersianus Lea. 

 Housei Lea. 

 gravidus Lea. 

 inornatus Lea. 

 lutens Lea. 

 eximius Lea. 

 tumidulus Lea. 

 rusticus Lea. 

 Sagittarius Lea. 

 substriatus Lea. 

 scobinatus Lea. 

 humilis Lea. 

 phaselus Lea. 

 Verreauianus Lea. 

 Africanus Lea, 

 ShurtlefBanua Lea. 

 exfulgens Lea. 

 Dunkerianus Lea. 

 Shuttleworthii Lea. 

 nucleus Lea. 

 Wheatleyanus Lea. 

 Brovvnii Lea. 

 suavidicus Lea. 



Siam. 



Siam. 



Siam. 



Siam. 



Siam. 



Newville, Burmah. 



Siam. 



Siam. 



Siam. 



Siam. 



Siam. 



Siam. 



Siam. 



Siam. 



Cape of Good Hope. 



Cape of Good Hope. 



Sina river, &c., India. 



Brazil. 



Brazil, &c. 



Australia. 



Siam. 



Rio Plata, Rio Negro. 



Mocha ? 



River Amazon. 



liCa* — Description of four new species of Exotic Uniones : 

 by Isaac Lea. 



Unio Nuttallianus Lea. 

 Cambodiensis Lea. 



Nev7Combianu8 T^ea. 



India. 



Takrong riv., at Korat, 



Cambodia. 

 Lake Nicaragua. 



