THE FAMILY NAIADES. 



19 



z 

 o 



D 



H 

 O 



!x 

 K 



Qh 



S 



z 



O 



z 



2^ 



OVAL. 



perov.itus. Con. 



al tills. Con. 



*multiiadiatus. hta. 

 Unio fasciola? Raj. 

 Unio fasciolus. Con. 

 Unio ligainentina. X)esA. 



*Novi-Eboraci. L«a. 



perovalis. Coji. 



*capsasformis. hta. 



Greenii. Con. 

 *pictus. Lea. 



tasniatus. Con. 



*iutevruptus. hea. 



*Menkianus. hta. 



*venustus. he.a. 



*ciassus. <S'rti/. liar.\ 

 Unio ellipiicLis. Tiar. 

 Unio carinatus. Har. 

 Unio liganientinn. Lam. 



OVAL. 



Mya gravis. Wood. 

 Unio fasciatus. Con.^ 



*orbiculatus. Hild. 



Unio abruptus.§ Say. 

 Unio crassus. Con. 



austialis. Lam. 



*Hydianus. Lea. 



*Claibornensis. Lea. 



*luteolus. Lam. 



Unio siliquoideus.il Bar. Con. 

 Unio inflatus. Bar. 



Childreni.^ Gray. 



pulcher. Lea. 



*radiatus. Lam. Bar. Hild. 

 Unio Virginiana. Lam. 

 Mya radiata. Gmel. Wood. Dill. 

 Mya oblongata. Wood. 

 Mya pictorum tenuis. Chem. 



*Medellinus. Lea. 



*notatus. Lea. 



*Vanuxemensis. Lea. 



t Mr Barnes made eleven varieties of crassus ; most of which were no doubt distinct species, some were 

 plicate. 



X Mr Conrad thinks the crassus of Say is fasciata of Mr Rafinesque. An examination of his description 

 ought to satisfy any one that the crassus of Say could not have been under the eye of the author when he made 

 his description of fasciata. 



§ The specimen figured by Mr Say in Amer. Conch. No. 2, is a female shell. The male shell is not abrupt 

 at the posterior margin. 



II Mr Say makes siliquoideus the same wilhviridis, 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 

 inextricable difficulty resulting from the confusion caused by Mr Rafinesque. See "Observations," p. 13, in 

 Magazin de Zoologie. 



U I have never seen this species, but presume, from the figure in Griffith's Cuvier, very poor as it evi- 

 dently is, that it is a distinct species. 



