1915.] NATURAL SCIENCES OF PHILADELPHIA. 559 



Unio rafinesquei n- n. 



I propose the name Unio rafinesquei for Unio fuscatus Lea, Obs. 

 iv, p. 35. PI. 40, fig. 4 (not U. fuscata Raf . 1820) ; Simps. Synopsis, 

 p. 717; Descr. Catal., p. 643. 



Pleurobema simpsoni n. n. 



I propose the name Pleurobema simpsoni for Unio striatus Lea, 

 Obs. iii, p. 41, PI. 12, fig. 16 (not U. striata Raf. 1820); Simps. 

 Synopsis, p. 762; Descr. Catal., p. 795. 

 Pleurobema conradi n. n. 



I propose the name Pleurobema conradi for Unio maculatus Conr. 

 New. F. W. Shells (1834), p. 30, PI. 4, fig. 4 (not U. maculata Raf. 

 1820); Simps. Synops., p. 746; Descr. Catal., p. 737. 



