164 



is almost vertically above the middle of the front margin. On a side view 

 the outline from the middle of the posterior margin to the apex forms 

 almost a complete quarter of a circle with a tendency to become spiral on 

 approaching the apex. Beneath the apex the outline is concave to the 

 middle of the front margin. The form of the shell is a cone with the apex 

 incurved. 



Length 6 lines ; width about 5^ lines ; height 3 lines. 



Locality and Formation.. — English Head, Anticosti; Hudson River 

 group. 



Collector. — J. Richardson. 



Pleurotomaria Elora. (N. sp.) 



Fig. 135. Pig. 136. 



Fig. 135. — Pleurotomaria Elora. 

 136. — P. Galtensis, 



Description. — Spire conical, rather strongly elevated; whorls in the 

 cast depressed convex on the upper side, with a sharp-edged margin all 

 round, just within which there is a slight concavity, most distinct on the 

 last whorl. Base nearly flat ; umbilicus about one third the whole width, 

 deep, extending to the apex. 



Width of a specimen of the average size 18 lines ; height 10 lines. 

 There are from four to six whorls. 



Locality and Formation. — Elora ; Guelph fonnation. 



Collector.— R. Bell. 



Pleurotomaria Galtexsis. (N. sp.) 



Fig. 136. 



Description. — Shell in the cast depressed conical, sub-lenticular ; apical 

 angle about 100°. Whorls from four to six, nearly flat on the upper side, 

 gently convex on the inner and very slightly concave near the outer side. 

 Margin aU round angular. Under side strongly convex. Umbihcus small, 

 about one fifth the whole width in the cast. Aperture rounded on the 

 lower side, concave on the inner side, and nearly straight above. 



