185 ANNALS OF THE CARNEGIE MUSEUM. 
6. Unio alatus Say = Proptera alata (Say). . 
From Coraopolis in Philadelphia Academy and Carnegie Museum ; 
from Beaver in Philadelphia Academy. 
7. Unio coccineus Lea = Quadrula coccinea (Lea). 
From Wampum in Philadelphia Academy and Carnegie Museum. 
8. Unio cooperianus Lea = Quadrula cooperiana (Lea). 
No specimens of this species could be found in the Philadelphia 
Academy, and none are in the Carnegie Museum. But the writer has 
found this species in the Ohio River in Beaver County, and thus the 
record is confirmed. 
g. Unio cornutus Barnes = Oddiguaria reflexa Rafinesque. 
From Beaver in the Philadelphia Academy. Rhoads reports it also 
from Coraopolis, but no specimens from this locality have been seen 
by the writer. 
1o. Unio cylindricus Say = Quadrula cylindrica (Say). 
From Coraopolis and Beaver in Philadelphia Academy ; from Wam- 
pum in Philadelphia Academy and Carnegie Museum. 
11. Unio crassidens Lamarck. 
From Coraopolis in Philadelphia Academy and Carnegie Museum ; 
from Beaver in Philadelphia Academy. 
12. Unio donaciformis Lea = Plagiola donaciformis (Vea). 
The specimens recorded from Coraopolis are in the Philadelphia 
Academy. This species has not been found in recent investigations. 
13. Unio elegans Lea = Plagiola elegans (Lea). 
From Coraopolis in Philadelphia Academy. 
14. Unio gibbosus Barnes. 
From Coraopolis in Philadelphia Academy and Carnegie Museum ; 
from Beaver in Philadelphia Academy ; from Wampum in Philadelphia 
Academy and Carnegie Museum. 
15. Unio irroratus Barnes (sic!) = Cyprogenia irrorata (Lea). 
Only one specimen from Beaver in the Philadelphia Academy. 
16. Unio kirtlandianus Lea= Quadrula subrotunda kirtlandiana 
(Hea. 
From Wampum in Philadelphia Academy and Carnegie Museum. 
17. Unio lens Lea = Odovaria circulus (Lea). 
From Coraopolis in Philadelphia Academy; from Wampum in 
Philadelphia Academy and Carnegie Museum. 
18. Unio ligamentinus Lamarck = Lampsitis ligamentina (Lamarck). 
From Coraopolis and Wampum in Philadelphia Academy and 
Carnegie Museum ; from Beaver in Philadelphia Academy. 
