247 

 HELICOTOMA PROSERPINA. (N. sp.) 



Fig. 233. 

 Fig. 233. Helicotoma Proserpina. The underside. 



Description. Shell large, consisting of about four sub-cylindrical 

 whorls ; spire nearly flat, the inner whorls being only slightly elevated 

 above each other ; suture apparently deeply impressed. On the upper 

 side the whorls are slightly flattened along the middle, rounded at the 

 edges. On the under side they are strongly and uniformly convex. The 

 outer side is somewhat flattened and approaching the vertical, but rounded 

 above and below. The umbilicus is about half the whole width. 



Width of the specimen 30 lines ; height of the last whorl 9 lines ; 

 width 8 lines. 



This species is founded on a single specimen, which retains apart of the 

 shell, but so covered by adherent matter that the surface characters can- 

 not be ascertained. On the outside of the last whorl there are visible 

 some oblique undulations which cross from the margin downwards and for- 

 wards. These, no doubt, indicate the course of the striae, which, most 

 probably, curve backwards to the margin, both above and below. 



Locality and Formation. G, Cape Norman, Newfoundland ; Quebec 

 group. 



Collector J. Richardson. 



HELICOTOMA TRITONIA. (N. sp.) 



Description. The specimen is a fragment consisting of four whorls ; 

 width 19 lines ; height about 6 lines. Spire gently concave ; whorls sub- 

 cylindrical, on the upper side, with a narrow elevated ridge at the margin, 



