80 



ANODONTA. 



fe 



c 



Q 



, 

 o -^ 



1 

 I 



OVAL. 

 *ferruginea. 



*salmonia. Lea. Han. 



*imbecillis. 



An. incerta. Lea. Kilst. Han. 

 An. horda. 1 Gould. 



*implicata. Say. Gould. Linsl. Miyh. 



Dekay. Stimp. 

 An. Newtonensis. Lea. Han. 

 An. Housatonica. Lind. Gould. 



Stimp. 

 An. excurvata. Dekay. 



*Dunlapiana. Lea. 



*fluviatilis. Dill. Lea. Gould. Adams. 



Linsl. Dekay. Han. 

 Myt. fluviatilis. 2 Dill., not Gmel. 



Wood. 



Myt. illitus. Soland.f 

 Myt. marginatus. Eat. 

 An. cataracta. Say. Sow. Kilst. 



Migh. Desh. 3 

 An. marginata. Say. Adams? 



Linsl. Migh. Stimp. 

 An. teres. Con. 

 Unio cataracta. Desh. 



*Tryonii. Lea. 

 *virgulata. Lea. 

 *Lewisii. Lea. 



o -I 

 P 



OVAL. 



*lacustris. Lea. 



*Dariensis. Lea. 

 *opaca. Lea. 

 *crepera. Lea. 

 *Arkansensis. Lea. 



reticulata. Reeve* 



dactylus. Sow. 



*Mortoniana. 1 Lea. Hupe. Han. 

 An. Chiquitana. D'Orb. 

 Craspedodonta smaraydina? Anton. 

 Kust. 



*Napoensis. Lea. 

 *Wymanii. Lea. 



*glauca. 6 Valen. 

 An. glauca. Lam. 

 An. ovatus. Swain. 



*ovata. Lea. Han. 

 An. subanyulata. Anth. 



*Youkanensis. Lea. 



*plana. Lea. Dekay. Han. 

 An. declivis. Con. 



1 I have several times had specimens from Texas, and have no doubt of its being Say's imbecillis, 

 which has such an extraordinarily wide geographical distribution in the Southern and Western States. 



* See note on An. cygnea. 



s Trait. Elern., vol. ii. p. 218. 



4 Mr. Reeve (Conch. Icon., No. 21) gives this as being Dr. Gould's species. But I am not aware of 

 his having described an Anodonta under this name. The figure is so closely like Arkansensis, Lea, that 

 I should not be surprised if it be the same, and coming from North America. 



6 D'Orbigny gives An. trigonum, Spix., as a synonym. 



6 The figure of this shell resembles some individuals of Myt. fluviatilis, Soland. (Say's An. cataracta), 

 but is straighter on the superior margin. In this character it resembles the trapezialis. The observa- 

 tions of Barnes, being made when little was known of this genus, cannot now be admitted. 



