INDEX TO PLATES. 35 



PLATE LI. 



Fig. 1. BuLiMus DEALBATus Say. The typical form, 

 p. 276. 



Fig. 2. BuLiMus DEALBATUS. The variety described 

 by Say as BuUmm alternatm, Say. p. 277. 



PLATE LI a. 



Bdlimus DEALBATUS Say. A thicliened, elongated 

 form from Texas, the Bulimus hictarius, Meiike. p. 277. 



PLATE Lib. 



Bulimus dealbatus Say. A heavy blanched shell, 

 from Southern and Western Texas and New Mexico, ajipar- 

 ently the same as Bulimus Scheidiaiim, 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 M tiller, p. 283. 



PLATE LIIL 



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. 29.3. 



Fig. 4. Bulimus subula Pfeiffer, p. 285. 



