214 PROCEEDINGS OF THE ACADEMY OF 
a wide, slight projection to the cutting edge. A comparison of 
the description and figure of the dentition of the European spe- 
cimens given by Thomson and Lehmann shows no specific differ- 
ence. It will be noticed that Lehmann’s figure of the centrals 
shows a more developed reflection and cusp and no side cusps. 
I believe, however, that careful comparison will show no variation 
in this or other particulars. 
Subgenus FRUTICICOLA. 
The two species of this subgenus found within our limits, H. 
rufescens and H. hispida, are purely local, having been introduced 
by commerce at Quebec and Halifax, respectively. Ihave not had 
an opportunity of examining either. The jaw of the subgenus is 
described as arcuate with blunt ends; anterior surface with broad, 
crowded ribs (see figure of that of hispida copied 
Fig. 57. from Moquin-Tandon); Lehmann (l. ¢c., pl. XIL., 
(LL) fig. 57) figures the lingual membrane of hispida 
Sb with centrals having a long narrow base of attach- 
Helix hispida, ment, a stout, pear-shaped, unicuspid reflection ; 
laterals bicuspid, marginals a simple modification 
of the laterals. Other species are also figured by Lehmann. 
Subgenus DoRCcASIA. 
I hesitate to place our two species, H. Berlandieriana and 
grvseola in this subgenus on account of the geographical range of 
its species. I will, however, temporarily leave them here. I do 
not believe they properly belong to Pruticicola. 3 
I have not examined H. Berlandieriana. The other species, 
griseola, has a jaw (pl. XVI., fig. 14) slightly arcuate; high, ends 
scarcely attenuated, blunt; cutting margin without median pro- 
jection; anterior surface entirely covered with numerous, about 
12, broad, crowded ribs, denticulating either margin. 
Lingual membrane (pl. XIILI., fig. 2.) long and narrow. Teeth 
about 27—1—2", with 12 perfect laterals. Centrals with the base of 
attachment long and rather narrow, the outer lower angles but little 
expanded, the upper margin broadly reflected; reflection large, 
with a very stout, long median cusp, bearing a long, stout cutting 
point extending below the lower edge of the base of attachment, 
side cusps obsolete, but side cutting points present, large, tri- 
angular, acute. lLaterals like the centrals, but unsymmetrical by 
