ANODONTA. 



51 



' OVAL. 



*Stewartiana. Lea. 

 *virens. Lea. 



*gibbosa. Say. 



An. inflata. Major Le Conte's Cabi- 

 net. 



*Couperiana. Lea. 



puelchana. D' Orb. 



*grandis. Say. Lesueur. 

 An. corpulenta. Coop. 



OBLONG. 



*tetragona. Lea. 

 *Ti'outwiniana. Lea. 

 *Sliaefferiana. Lea. 

 *subcrassa. Lea. 



SUBROTUND. 



*suborbiculata. Say. 

 *globosa. Lea. 

 *Linnaeana. Lea. 



WIDE. 



*Maryattana. Lea. 

 elongata. Swain. 



f WIDE. 



*ensiformis. Spix. If Orb. Sehom. 

 Kust. 



*siliquosa. Spix. 



*cylindracea. Lea. 



*subcylindracea. Lea. Linsl. Lekay. 

 Stimp. 



lucida. D' Orb. 



*Buchanensis. Lea. 



*gracilis. Lea. 



*Wheatleyi. Lea. 



*exilis. 1 Lea. 



*Schroteriana. Lea. 



OBOVATE. 



*obtusa. Spix. Kust. 

 An. lituratum. Spix. 



Montezuma. Lea. 



*sirionos. L' Orb. 



An. Ferrarisi. D' Orb. 



*Patagonica. Lam. Kust. 



*lato-marginata. 2 Lea. L>' Orb. 

 An. trapezeus? 3 Sp>ix. 

 An. rotundus? Spix. Kiist. 

 An. membranacea. i D' Orb. 



1 Prof. Kirtland informed me that lie received this shell from Wallingford, Conn., taken from some of the 

 branches of the Quinipiak River, but I think this must be an error. When I described it, I mentioned having pur- 

 chased it of Mr. Warren, a dealer in Boston, who could give me no idea whence it came. I never supposed it to 

 be an American species, and my conclusion is justified, I think, by having received the same species from Dr. Von- 

 denbusch, of Bremen, he having procured it from Java. 



2 The Patagonica and lato-marginata, when they are better observed, may prove to be the same. 



3 Spix's figure so closely resembles the lato-marginata, that I scarcely feel a doubt as to their being the same. 

 He does not, however, notice the broad margin which is so characteristic of this species. 



4 See note 4, p. 34. 



