INDEX TO PLATES. 33 



figures, with the closed umbilicus, represents the variety 

 separated by Mr. Say, under the name of H.fraterna. The 

 second series represents the H. Leai, Ward MS. The 

 third and fourth represent different sizes of the typical 

 form. p. 147. 



PLATE XLII. 



Fig. 1. HELIX DEMISSA Binney, p. 232. 



Fig. 2. HELIX MOBILIANA Lea, p. 172. 



Fig. 3. HELIX HIRSUTA Say. Small, subglobular 

 form. p. 150. 



Fig. 4. HELIX HIRSUTA Say. Large, discoidal form. 

 Lingual booklets, p. 152. 



PLATE XLIH. 



HELIX BUFFONIANA Pfeiffer. This plate was un- 

 fortunately lettered " Helix aspersa," before it was discov- 

 ered to be different from that shell, p. 115. 



PLATE XLIV. 



Fig. 1. HELIX SPINOSA Lea, p. 153. 

 Fig. 2. HELIX EDGARIANA Lea, p. 155. 



PLATE XLV. 



Fig. l. HELIX TEXASIANA Moricand,p. 191. 



Fig. 2. HELIX INFLECTA Say, (lettered fig. 3, in text,) 

 p. 143. 



Fig. 3. HELIX INFLECTA Say. Regarded as the young 

 of fig. 2. Probably H. triodonta, Jan. 



PLATE XL VI. 

 HELIX POLYCHROA Binney, (erroneously lettered 



VOL. III. 5 



