THE FAMILY NAIADES. 



25 



OVAL. 



orbiculatus. Hild. 



Unio abruptus.* Say. 

 Unio crassus. Co/i. 



australis. Lam. 



Hydianus. Lea. 



luteolus. Lam. 



Unio slliquoideus.t Bai\ Con. 

 Unio inflatus. Bar. 



Childreni.t Gray. 



pulcher. Lea. 



radiatus. Lam. Bar. Hild. 

 Unio Virginiana. Lam. 

 Mya radiata. Gm.el. Wood. Dill. 



examination of his description ought to satisfy any one that the crassus of 

 Say could not have liecn under the eye of the autlior when he made his de- 

 scription oi fasciata. 



* The specimen figure by Mr. Say in Amer. Conch. No. 2, is a female 

 shell. The inale shell is not abrupt at the posterior margin. 



-(- Mr. Say makes siliquoideus the same with viridis, Raf. Ferussac, in 

 his cabinet, makes it the same with fasciata, Raf. Mr. Conrad makes it the 

 same with vittata, Raf, Ferussac, in his " Observations," states the inex- 

 tricable difficulty resulting from the confusion caused by Mr. Rafincsque. — 

 See " Observations," p. 13, in Magazin dc Zoologie. 



\ I have never seen this species, l)ut presume, from the figure in Griiiith's 

 Cuvier, very poor as it evidently is, that it is a distinct species. 



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