12 



SYNOPSIS OF 



XTi 



H 

 o 



I— I 



W 

 O 



>^ 

 I 



o 



;z; 



QUADRATE. 



Nicklinianus. Lea. 

 coelatus. Con. 



multiplicatus.* Lea. 



Unio heros. Say, in Disseminator. 



Unio undulatus. Say, Am. Conch. No. 2. 



Deshayes. 

 Unio heros. *S'ay, Am. Conch. No. 6. 



undulatus. ^«r. Valen. Hild. Desk. 

 Unio costata? i?fl/) 

 Unio costatus. Con. 



plicatus. Lesueur. Say. Bar. Eat. Hild. 

 Unio Peruviana. Lam. 

 Unio rariplicata. Latn. 

 Unio Dombeyanus. Valen. 

 Unio undulata. Desk. 

 Unio multiplicata, Z)e5^. 



trapezoides. Zea. 



Unio crassidens. Lam. Var. a. 

 [^ Unio interruptus.t Say. 



* When I described the imdtiplicatus in 1830, 1 had had several speci- 

 mens for two or three years, and was not aware that Mr. Say had pubUshed a 

 shell under the name of heros, which he subsequently abandoned as the un. 

 dulatus of Barnes; but in 1834 reclaimed as heros. I consider that Mr. 

 Say's abandonment of the species entitles me to it, if my previous claim be not 

 sufficient. 



•j- Mr. Say, in his " Synonymy," claims precedence in this species, although 



