46 
Plate V 
(Natural size) 
Yakounoceras abruptum n. sp. (Page 9.) 
Figure I. Side view of holotype. National Museum of Canada, Cat. No. 9003. 
Toricelliceras newcombii (Whiteaves). (Page 12.) 
Figure 2. Ventral view of holotype. National Museum of Canada, Cat. No. 5990. 
Figure 3. Side view, same specimen. 
Figure 4. Suture line at beginning of ultimate whorl, same specimen. 
