INDEX TO PLATES. 29 



PLATE XXII a. 



Fig. 1. HELIX SPORTELLA Gould, p. 211. 



Fig. 2. HELIX LUCIDA Drap. p. 233. 



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

 umbus, Ohio, by Mr. J. Bartlett. 



Fig. 3. HELIX EGENA Say, p. 245. 



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

 are unknown. 



PLATE XXIII. 

 HELIX SAYI Binney, p. 180. 



PLATE XXIV. 



HELIX SOLITARIA Say, p. 208. 



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

 are those of H. pulchella. 



-\ . rVy -.VMS. * TV*. ' ' 



>3 ^ (vwvjv- ., i \' v v\>-v- vy)(x\\ 



PLATE XXV. 



HELIX ALTERNATA Say, p. 212. Lingual booklets, 

 p. 215. 



PLATE XXVI. 



HELIX CUMBERLANDIANA Lea, p. 216. 



PLATE XXVI a. 

 HELIX STRIGOSA Gould, p. 210. 



PLATE XXVII. 



HELIX TRIDENTATA Say. The vertical series repre- 



