214 PROCEEDINGS OP THE ACADEMY OP 



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. I have 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 



F 'g- 5.7. from Moquin-Tandon); Lehmann (1. c, pi. XII., 



/f7[jXUjT|\ fig. 57) figures the lingual membrane of hispiida 



"^ with centrals having a long narrow base of attach- 



Jaw of " 



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 Dorcasia. 



I hesitate to place our two species, H. Berlandieriana and 

 gnseola 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 Fruticicola. 



I have not examined H. Berlandieriana. The other species, 

 griseola, has a jaw (pi. 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 (pi. XIII., fig. 2.) long and narrow. Teeth 

 about 27 1 27, 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. Laterals like the centrals, but unsymmetrical by 



