250 PROCEEDINGS OF THE ACADEMY OF 
Helix fidelis, Gray. (Aglaja.) Am. Journ. Conch., VI. 207, pl. ix. 
tes Is We 
Jaw said to be ribless, but a better specimen found normal, Proc. Phila. 
Ac. N. 8c., 1872, 136. 
Helix redimita, W. G. Binn. (Arionta.) Am. Journ. Conch., VI. 
206. pla xe hice 
Helix tudiculata, Binney. (Artonta.) Am. Journ. Conch., VI. 208, 
Tl, Wise, TYR, “Ye 
Helix Townsendiana, Lea. (Artonta.) Am. Journ. Conch., VI. 206. 
Helix reticulata, Pfr. (Ardonta.) Am. Journ. Conch., VII. 177. 
Helix Nickliniana, Pfr. (Ardonta.) Am. Journ. Conch., VII. 177. 
Helix Tryoni, Newce. (Huparypha) jaw, W. G. B. Am. Journ. 
Conch., I. 93, pl. vi. fig. 2-10. 
Showing variation in number of ribs. 
Helix Gossei, Ad. (Coryda.) Am. Journ. Conch., VII. 177. Lingual 
membrane only. 
Helix aspera, Fer. (TVhelidomus.) Am. Journ. Conch., VI. 204. 
Helix notabilis, Shuttl. (Zhelidomus.) Am. Journ. Conch., VII. 177. 
Lingual membrane only. 
Helix pemphigodes, Pfr. (Oysticopsis.) Am. Journ. Conch., VII. 177. 
Lingual membrane only. 
Helix tumida, Pfr. (Cysticopsis.) Ann. Lyc. N. H. of N. Y., 1X. 2838, 
fig. 3, lingual. | 
Jaw, different from generic description, figuredin Am. Journ. Conch., VI. 
208, fig. 2. 
Helix loxodon, Pfr. (Plagioptycha.) Am. Journ. Conch., VII. 177. 
Unlike the generic description, the jaw has a median projection, and is 
ribless. 
_ Helix diaphana, Lam. (Plagioptycha.) Am. Journ. Conch., VII. 178. 
See last species. 
Helix monodonta, Lea. (Plagioptycha.) Am. Journ. Conch., VII. 
178. See last. 
Helix Albersiana, Pfr. (Plagioptycha.) Amer. Journ. Conch., VII. 
178. Jaw same as in last species. 
Helix macroglossa, Pfr. (Plagioptycha.) Am. Journ. Conch., VII. 178. 
Jaw with median projection and no anterior ribs. 
Helix varians, Mke. (Polymita.) Am. Journ. Conch., VI. 206, lingual. 
Helix muscarum, Lam. (Polymita.) Am. Journ. Conch., VI. 204, pl. 
ix. fig. 4, 16. 
Jaw ribless, lingual widely differing from the usual type of Heliz. 
Helix graminicola, Ad. (Polymita.) Amer. Journ. Conch., VII. 178. 
Jaw different from generic description of Helz# in having no anterior ribs 
—and in having a median projection to its cutting edge. 
