42 



UNIO. 



a. 



I 



OVAL. 



*capax.' Green. Con. Kilst. 

 Sym. glolosa. Lea. 

 Unio ventricosus. Reeve. 



*splendidus. Lea. Han. 



*ocliraceus. Say. Con. Gould. Lins- 

 ley. DeTcay. Miyli. Potier. Han. 



Sym. ochracea. Lea. 



Unio rosaceus. Con. 



Larnpsilw ochracea. Stimpson. (Agass. 

 MSS.) 



Mya ochracea. Eat. 



*delicatus. Lea. 



stagnalis. Con. 

 Unio Ogeecheensis. Con. 



*Clarkianus. Lea. 

 *crocatus. Lea. Chenu. 

 *Cainbodiensis. Lea. 

 *affinis. Lea. 

 Mauritianus. Lea. 



*cariosus. Say. Bar. Gould. Linsley. 

 Dekay, Potier. Sh. & Eat. Han. 

 Unio cariosa? Lam. 

 Unio ovata. Valen. 

 Unio luteola. Con.; not of Lam. 

 Unio oratus. Con. 

 Larnpsilis cariosa. Stimpson. (Agass. 



MSS.) 

 Mya cariosa. Eat. 



OVAL. 



*Spillmanii. Lea. 



*fascinans. Lea. 

 *vivescens. Lea. 

 *Georgianus. Lea. Chenu. 



perovatus. Con. Han. 

 *altilis. Con. Han. 



callosus. Lea. 



*multiradiatus. Lea. Desh. Chenu. 



Han. 



Unio fascio la ? Eaf. 

 Unio fasciolus. Con. Kilst. 

 Unio ligamentina. Desh. 



*doliaris. Lea. 



saxeus. Con. 



perovalis. Con. Han, 

 *capsaeformis. Lea. Con. Han. 

 *deviatus. Anthony. 

 *turdigulus. Lea. 



*Florentinus. Lea. 

 Unio sacculus. Anth. 



*Greenii. s Han. Con. 

 *simplex. Lea. 



1 Mr. Say considers capax as a variety of cardium, Raf., of ventricosus^ Bar., of occidens, Lea, and 

 subouatus, Lea, while Mr. Conrad considers it as occidens, Lea. Capax is a perfectly distinct species, 

 and I had considered it so for some years before either Dr. Green or I described it. He preceded me a 

 short time, of which I was not aware, as it was published in an unusual periodical for such matter. 



' U. cariosa, Lam. (Yar. 2), is the Alas, marginata, Say. 



' The description and figure in Mr. Conrad's Monograph differ from those in his New Fr. Wat. Shells. 



