1915.| NATURAL SCIENCES OF PHILADELPHIA, 559 
Unio rafinesquei n. n. 
I propose the name Unio rafinesquei for Unio fuscatus Lea, Obs. 
iv, p. 35, Pl. 40, fig. 4 (not U. fuscata Raf. 1820); Simps. Synopsis, 
p. 717; Descr. Catal., p. 643. 
Pleurobema simpsoni n. n. 
I propose the name Plewrobema simpsoni for Unio striatus Lea, 
Obs. iii, p. 41, Pl. 12, fig. 16 (not U. striata Raf. 1820); Simps. 
Synopsis, p. 762; Deser. Catal., p. 795. 
Pleurobema conradi n. n. 
I propose the name Plewrobema conradi for Unio maculatus Conr. 
New. F. W. Shells (1834), p. 30, Pl. 4, fig. 4 (not U. maculata Raf. 
1820); Simps. Synops., p. 746; Descr. Catal., p. 737. 
