22 



SYNOPSIS OF 



m 

 a 

 •& 

 o 



z 



Eh 



° < 

 Z 1 



Ix 



K 



0. 



>- 



Z 

 O 



z 



OBLONG. 



*jejunus. Lea. 



*complanatus. Lea. 

 Mya complanata. 

 Unio violaceus.f 

 Unio purpureus.:}: 

 Unio rarisulcata. 

 Unio coarctata. 



°\ 



Soland. 

 Spangler. 



Say. Bar. 

 Lam. 

 Lam. 



Dill. 



Unio purpuiascens. Lam. 

 Unio rhombula. Lam. 

 Unio caiinifera. Lam. 

 Unio Georgina. Lam. 

 Unio glabrata. Lam. ' 

 Unio sulcidens. Lam. 

 Unio fluviatilis. Green. 

 Mya ligida ? Wood. 



*Gnffithianus. Lea. 



*auratns. Lea. 



Niiia auiata. Swain. 

 Unio obtusa.§ Fer. 

 Unio depiessus.§ Less. 



*atratus. Lea. 



Niaa atiala. Steain. 

 Niaa fragilis. Sioain. 



*confeitus. Lea. 



*palialus. RaveneVs Letter. 



Waleieensis. Lea. 

 Unio Raveneli.ll Con. 



m 



w 

 z 

 o 



z 



H 



Z^ 



Ix 



o 



OBLONG. 



*fLilvus. Lea 



Unio icteiinus. Con. 



*Congar8eus. Lea. 



*declivis. Say. 



Unio geometricus.^ Lea. 



*Blandingianus. Lea. 



*depiessus. Lam. D^Orb. 



angustus. Lam. 

 *modestus. Fer. 



*litoialis. Lam. Pfeif. Des Moid. Oral. 

 Unio crassus. Schr. Relz. JVeil. 



Speng. 

 Unio rhomboidea. Schr. 

 Unio brevialis. Lam. 

 Unio semirugata. Lam. 

 Unio nana. Lam. 

 Unio subtetragona. Mich. 

 Unio incurvus. Lea. 

 Unio Pianensis. Farines. 

 Unio granosus. Schum. 

 Mysca ovata. 7\irt. 

 Mya depiessa. Don. 



SUBROTUND. 



*ciiculiis. Lea. Eat. 

 Mya roliinda? Wood. 



*lens.ft Lea. 



t On the authority of Ferussac. 



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

 'latus a synonym. 



§ On the authority of D'Orbigny. 



II Prof. Ravenel's name being previously used for a Unio (Amer. Phil. Sec. 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. 



If 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 circuhis. I am not, how- 

 ever, sure, that it is not distinct. 



