29 



OVAL. 



*Prevostianus. Lea. 



*radiatus. Lam. Bar. Desk. (Ency. 



Ver. T. 2.) MenJce. Gould. Lins- 



ley. Migh. Dekay. Kiist. 

 TJnio Virginiana. Lam. MenJce. 

 Mya radiata. Gmel. Wood. Dill. 



Schreib. 

 Mya oblongata. Wood. 

 Mya pictorum tenuis. Chem. 

 Lampsilis radiata. Stimpson. (Agass. 



MSS.) 



*regularis. Lea. Chenu. 

 *amEemis. Lea. Chenu. 

 *Sapotalensis. Lea. Chenu. 

 *Oregonensis. Lea. 

 *profugus. Gould. 

 *Medellinus. 1 Lea. Chenu. 

 *notatus. Lea. Chenu. 

 *subangulatus. Lea. Chenu. 

 *Vanuxemensis. Lea. Chenu. 

 *Nashvillianus. Lea. 

 *Mississippiensis. Con. 

 *Zeiglerianus. Lea. Chenu. 

 lienosus. Con. Kiist. 



fovAL. 



*constrictus. Con. 



*placitus. Lea. 

 *buxeus. Lea. 



*concavus. Lea. 

 *obscurus. Lea. 

 *proximus. Lea. 

 *nitens. Lea. Chenu. 

 *Gouldii. Lea. 



*delodontus. Lam. D'Orb. Chenu. 

 TJnio lacteolus. Lea. 

 TJnio rhuacoica. D'Orb. 



*Moussonianus. Lea. 



*charruanus. 2 D' Orb. 



*Monroensis. Lea. 



*caliginosus. Lea. 



*Binneyi. Lea. 



*lamellatus. Lea. Chenu. 



productus. Mouss. 3 



mutatus. Mouss. 



exilis. Dunk. 



1 Mr. Say's purjmriatus and this may be the same. I have never seen his specimens, and there is no figure. 

 The description is in the Disseminator, Jan. 1, 1831. 



3 The two specimens sent to me by M. D'Orbigny are so like debdbntm, that I am strongly induced to believe 

 they will prove to be the young of that species. 



3 Mr. Conrad having preoccupied this name, it necessarily must be changed, and, as I have already called a 

 shell after M. Mousson, 1 cannot conform to the usual mode of giving it his name. I propose for it productior. 

 His shell is described in his Fresh Water and Land Shells of Java, p. 17, Fig. 3. 



