155 



Width 14 lines ; height about 10 lines. 



Locality and Formation. — Gait ; Guelph formation. 



Collector.— B.. Bell. 



Pleurotomaria Dbiopeia. (N. sp.) 



Description. — Shell obtusely conical ; apical angle about 90° ; whorls 

 about four, with a narrowly rounded outer margin, above which they are 

 gently convex or somewhat flat all the way to the suture. On the under 

 side the body whorl is gently convex. The suture is deep, and the upper 

 whorls project a little over those below them. Surface beautifully orna- 

 mented with fine angular revolving ridges, of which there are five or six 

 in the width of one line. These are crossed by finer lines, which curve 

 backwards to the outer edge, crossing obliquely and producing a rhom- 

 boidal cancellation. There appears to be a rounded band on the outer 

 edge of the whorls, with a gentle concavity just above it. 



Height 15 lines ; width about 20 lines ; height of body whorl 8 lines. 



Locality and Formation. — Blora ; in the Guelph formation. 



Collector.— &. Bell. 



MuKCHisoNiA Xanthippe. (N. sp.) 



Fig. 13'7. 



Fig. 138. 



Fig. 139. 



Fig. 137. — Murchisonia Xanthippe, drawn from a gutta-percha cast. 



138. — M. Vitellia, do. do. 



139.— ilf. ^ Estella, do. do. 



Description. — Spire acutely conical ; apical angle from 40° to 50° ; 

 whorls six or seven, acutely angular along the middle (screw-shaped), the 



