80 



AN^ODOIf T A. 



OVAL. 



*ferruginea. Lea. 



*salnionia. Lta. Han. 



■^imtecillis. Say. Adams. 



An. incerta. Lea. Kilst. Han. 

 An. horda} Gould. 



*implicata. Say. Gould. Linsl. Migli. 



Dekay. Stimp. 

 An. Newtonensis. Lea. Han. 

 An. Housatonica. Lind. Gould. 



Stimp. 

 An. excurvata. Delcay. 



*Dunlapiana. Lea. 



*fluviatilis. Dill. Lea. Gould. Adams. 



Linsl. Dekay. Han. 

 Myt. fluviatilis.^ Dill., not Gmel. 



Wood. 

 Myt. illitus. Soland.f 

 Myt. marginatus. Eat. 

 Ari. catarada. Say. Sow. Kiist. 



High. Desh.^ 

 An. marginata. Say. Adams f 



Linsl, Migh. Stimp. 

 An. teres. Con. 

 Unio catarada. Desk. 



*Tryoiiii, Lea. 



*virgulata. Lea. 



*Lewisii. Lea. 



OVAL. 



*lac"astris. Lea. 



*Dariensis. Lea. 



*opaca. Lea. 



*crepera. Lea. 



*Arkansensis. Lea. 



reticulata. Reeve.^ 



dactylus. Sow. 



*Mortoniana.' Lea. Hupe. Han. 

 An. Ghiquitana, D^Orh. 

 Oraspedodonta smaragdina? Anton. 

 Kilst. 



*Napoensis. Lea. 



*Wymaiiii. Lea, 



*glax"ica.^ Valen. 

 An. glauca. Lam. 

 An. ovatus. Swain. 



*ovata. Lea. Han. 

 An. subangulata. Anth. 



*Youkaiiensis. Lea. 



*plana. Lea. Dekay. Han. 

 An. declivis. Con. 



' I have sevei-al times liad specimens from Texas, and have no doulot of its being Say's imbecillis, 

 wlaich has sucli an extraordinarily wide geographical distribution in the Southern and Western States. 



" See note on An. cygnea. 



= Trait. Mem., vol. ii. p. 218. 



^ Mr. Reeve (Conch. Icon., No. 2Y) 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. 



^ D'Orbigny gives A7i. ti-igonum, Spix., as a S3Tionym. 



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

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

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



