60 
Figure 1 
Figure 2 
Figure 3 
Figure 4 
Figure 5 
Figure 6 
Plate XII 
(Natural size) 
Defonticeras defontii McLearn. (Page 13.) 
Suture line of holotype. National Museum of Canada, Cat. No. 9009. 
Ventral view, same specimen. 
Side view, same specimen. 
Defonticeras marcluindi n. sp. (Page 14.) 
Oblique view of holotype. National Museum of Canada, Cat. No. 9011. 
Side view, same specimen. 
Frogdenites? cf. profectus S. Buckman. (Page 18.) 
Side view of type. National Museum of Canada, Cat. No. 9015. 
