30 INDEX TO PLATES. 



sents specimens from the "Western States ; the lateral figures 

 represent New England forms. Tlie lingual booklets are 

 represented after the description, page 185. p. 183. 



PLATE XXVIII. 



Helix teidentata Say. Tiiis plate represents the 

 form called by Mr. Say Helix faUax. p. 183. 



PLATE XXIX. 



Fig. 1. Helix electrina Gould, p. 236. 

 Fig. 2. Helix indentata Say, p. 242. 

 Fig. 3. Helix arborea Say, p. 235. 

 Fig. 4. Helix cellaria Miiller, p. 230. 



PLATE XXIX a. 



Fig. 1. Helix capsella Gould, p. 239. 

 Fig. 2. Helix loricata Gould, p. 145. 

 Fig. 3. Helix Ottonis Pfeiffer, p. 238. 

 Fig. 4. Helix saxicola Pfeiffer, p. 174. 



PLATE XXX. 



Fig. 1. Helix perspectiva Say, p. 256. 

 Fig. 2. Helix striatella Anthony, p. 217. 

 Fig. 3. Helix limatula B i n n e y . Lingual booklets, 

 after the description undeteimined. p. 219. 

 Fig. 4. Helix interna Say, p. 247. 



PLATE XXXL 

 Helix fuliginosa Say, p. 222. 



