130 



liEA S SYNOPSIS OF 



O 



W 

 Eh 



O 



z 

 ai 



O 



OBLONG. 



*jejunus. Lea. 



*compIanatus. Lea. 

 Mya coinplanata. 

 Uiiio violaceus.f 

 Unio puipureus.| 

 Unio rarisulcata. 

 Unio coarctata. 



2^ 



Soland. Dill. 

 Spangler. 



Say. Bar. 

 Lam. 

 Lam. 



Unio purpurascens. Lam. 

 Unio rhombula. Lam. 

 Unio caiinifera. Lam. 

 Unio Geoigina. Lam. 

 Unio glabrata. Lam. 

 Unio sulcidens. Lam. 

 Unio fluviatilis. Green. 

 Mya ligida ] Wood. 



*Griffithianus. Lea. 



*auratus. Lea. 



Niaa aurata. Swain. 

 Unio obtusa.§ Fer. 

 Unio depiessus.§ Less. 



*atratus. Lea. 



Niaa atrata. Swain. 

 Niaa fragilis. Swain. 



*confertus. Lea. 



*paliatus. RaveneVs Letter. 



w 

 z 

 o 



H 



o 



Waleieensis. Lea. 

 Unio Raveneli.ll 



Con. 



OBLONG. 



*fulvus. Lea 



Unio icterinus. Con. 



*Congaraeus. Lea. 



*declivis. Say. 



Unio geometricus.^ 



*Blandingianus. Lea. 



Lea. 



*depressus. Lavi. D'Orh, 



angustus. Lam. 



*modestus. Fer. 



*litoialis. Lam. Pfeif. Des Moul. Grat. 

 Unio ciassus. Schr. Relz. J^eil. 



Speng. 

 Unio ihomboidea. Schr. 

 Unio brevialis. Lam. 

 Unio semiriigata. Lam. 

 Unio nana. Lam. 

 Unio subtetiagona. Mich. 

 Unio incuivus. Lea. 

 Unio Pianensis. Farines. 

 Unio granosus. Schum. 

 My sea ovata. Turt. 

 Mya depressa. Don. 



SUBROTUND. 



*circulus. Lea. Eat. 

 Mya rotunda 1 Wood. 



*lens.ff Lea. 



t On the authority of Ferussac. 



X Mr Conrad is wrong in his " Synoptical Table," in giving Mr Say's name precedence, making compla- 

 natiis a synonym. 



§ On the authority of D'Orbigny. 



II Prof. Ravenel's name being previously used for a Unio (Amer. Phil. Soc. Trans., Vol. V.), it becomes 

 necessary to change Mr Conrad's name, which I do, to that of the river in which it was found. 



% I do not find either of these names in Mr Say's Synonymy. He has, however, priority. 



tt I have some doubts whether this should be considered more than a variety of circulus. 1 am not, how- 

 ever, sure, that it is not distinct. 



