32 INDEX TO PLATES. 



small variety. A lamellar fold, beginning about one fourth 

 of a volution within the aperture, and running somewhat 

 obliquely about half a volution along the columellar side, 

 Las not hitherto been specified in desciiplions, though it has 

 been noticed by several observers ; and distinguishes this 

 shell from H. paludout, and other "West Indian species, 

 p. 196. 



PLATE XXXIX. 



Fig. 1. Helix septemvolva Say. The small con- 

 rex variety, p. 19JS. 



Fig. 2. Helix plicata Say, (should be H. fatigiata 

 Say,)" p. 193. 



Fig. 3. Helix pustula Say, p. 201. 



Fig. 4. Helix fatigiata Say. The large, flattened, 

 •■arinated variety, p. 195. 



PLATE XL. 



Fig. 1. Helix aueiculata Say. The mature shell. 

 p. 186. 



Fig. 2. Helix alriculata Say. The young shell, 

 described by Say under the name of Helix avara. Lin- 

 gual booklets, p. 189. 



PLATE XL a. 



Fig. 1. Helix leporixa Gould. The anne.xed cut 

 of lingual booklets is that of H. exoleta. p. 199. 

 Fio-. 2. Helix maxillata Gould, p. 157. 

 Fig. 3. Helix gekmaxa Gould, p. 156. 

 Fi"-. 4. Helix vultuosa Gould, ]). 189. 



PLATE XLL 



Helix mosodox Rackett. The upper series of 



