IXDEX TO PLATES. 29 



PLATE XXHa. 



Fig. 1. Helix sportella Gould, p. 211. 



Fig. 2. Helix lucida Drap.p. 23.3. 



Found also on the banks of the Mohawk, and near Col- 

 umbus, Ohio, by Mr. J. Bartlett. 



Fig. .3. Helix egexa Say, p. 245. 



The lingual booklets placed after the description, p. 246, 

 are unknown. 



PLATE XXIII. 

 Helix Sayi Binney, p. 180. 



PLATE XXI Y. 



Helix solitaeia Say, p. 208. 



The lingual liooklets at the end of the description, p 209, 

 are those of H. pulcheUa. 



PLATE XXV. 



Helix alternata Say, p. 212. Lingual booklets, 

 p. 215. 



PLATE XXVL 



Helix Cumberlaxdiaxa Lea, p. 216. 



PLATE XXVI a. 



Helix strigosa Gould, p. 210. 



PLATE XXVII. 



Helix tiudentata Say. The vertical series repre- 



