19 



Fig. 6. 



Fig. 6. — Bellerophon Canadensis. — Side and dorsal views. 



B. FRATERNUS, n. sp. — Ovate, about one inch in diameter ; whorls 

 three or four, all visible in the deeply concave umbilicus, depressed con- 

 vex on the dorsum, somewhat acutely carinated on the sides or at the um- 

 bihcal edge ; aperture slightly expanded, only a little larger than the 

 body of the whorl ; a sharp median ridge or keel extending from the aper- 

 ture a short distance backwards. In section the tube is transversely elhpti- 

 cal being compressed in the dorso-ventral direction ; the greater diameter 



