15}.0)0 0 ORS YID SYN) clean Kop ey aos ho PLATE XX. 
Top: Bullhead, Pleuwrobema aesopus (Green), from Wabash River. (See p. 33- 
Middle pair: Dromedary mussel, Dromus dromas (Lea), from Cumberland River. (See p. 33.) 
ower pair; Fan-shell, Cyprogenia irrorata (Lea). from Cumberland River. (See p. 33.) 
