THE FAMILY NAIADES. 



31 



"^ 



c 

 I— ( 



tD 



H 

 Eh 

 O 



I 



o 



o 



OBLONG. 



Unio rarisulcnta. Lam. 

 Unio coarctata. Lam. 

 Unio purpurascens. Lwrn. 

 Unio rhombula. Lam. 

 Unio carinifera. Lam. 

 Unio Georgina. Lam. 

 Unio glahrata. Lam. 

 Unio sulcidcns. Lam. 

 Unio fluviatilis. Green. 

 Mya rigida ? IVood. 



Griffithianus. Zea. 



auratus. Ze«. 



Niiia aurata. Swain. 



atratus. Zeo. 



Niaa atrata. Swain. 

 Niiia fragilis. Sivain. 



confertus. Ze«. 



paliatus. RaveneVs letter. 



Watereensis. Lea. 



Unio Raveneli.* Con. 



* Prof. Ravcncl's name being previously used for a iinio (Amcr. 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. 



