28 INDEX TO PLATES. 



PLATE XVI. 



vte yvi- 



HELIX TUDICULATA Binney, p. 117. 



PLATE XVII. 



Fig. 1. HELIX PULCHELLA Miiller, p. 175. Lin- 

 gual booklets, p. 209. 



Fig. 2. HELIX MINUSCULA Binney, p. 221. 



For PLATE XVH a, read PLATE XVII. 



Fig. 3. HELIX LABTRINTHICA Say, p. 202. Lingual 

 booklets, p. 260. 



Fig. 4. HELIX CHERSINA Say, p. 243. 



PLATE XVIII. 

 HELIX NUTTALLIANA Lea, p. 159. 



PLATE XIX. 

 HELIX TOWNSENDIANA Lea, p. 161. 



PLATE XX. 



HELIX VANCOUVERENSIS Lea, p. 166. 



PLATE XXI. 



HELIX CONCAVA Say, p. 163. 



PLATE XXII. 



HELIX PROFUNDA Say, p. 177. Lingual booklets, 

 p. 179. 



