INDEX TO PLATES. 35 



PLATE LI. 



Fig. 1. BULIMTJS DEALBATUS Say. The typical form, 

 p. 276. 



Fig. 2. BULIMUS DEALBATUS. The variety described 

 by Say as Bulimus alternatus, Say. p. 277. 



PLATE LI a. 



BULIMUS DEALBATUS Say. A thickened, elongated 

 form from Texas, the Bulimus lactarius, Menke. p. 277. 



PLATE Lib. 



BULIMUS DEALBATUS Say. A heavy blanched shell, 

 from Southern and Western Texas and New Mexico, appar- 

 ently the same as Bulimus Scheidianus, Pfeiffer, p. 277. 



PLATE LII. 



Fig. 1. BULIMUS FALLAX Gould, p. 288. 

 Fig. 2. PUPA MODICA Gould, p. 319. 

 Fig. 3. BULIMUS HARPA Say, p. 290. 

 Fig. 4. BULIMUS LUBRICUS Mil Her, p. 283. 



PLATE LIII. 



Fig. 1. BULIMUS EXIGUUS Say, p. 286. 



Fig. 2. ACHATINA PELLUCIDA Pfeiffer. Found liv- 

 ing, by Mr. Bland, on dead leaves and sticks floating in 

 brackish water, Island of St. Thomas. 



Fig. 3. ACHATINA GRACILLIMA Pfeiffer, p. 293. 



Fig. 4. BULIMUS SUBULA Pfeiffer, p. 285. 



