PLATE V. 



PAGE. 



Figs. 1-2. Gomphoceras Hyatti Whitf. 427 



1. Ventral view of the specimen figured on Plate IV showing the breadth of the 



specimen. 



Fig. 2. Gomphoceras Sciotense Whitf 428 



2. Diagram showing the form of the aperture and its relation to the body of the 



shell as seen in a top view of the specimen figured on Plate VI. 



