Bellerophon sp. 



23, 24 Views of the body and interior whorls of the same specimen, show- 

 ing the character of the ornament, x 2 

 Gaspc sandstone. Gaspe Basin 



Bellerophon plenus Billings 



Page 153 



25 Dorsal view of the apertural portion of the exterior 

 Grande Greve limestone. Lehuquet's Cove 



26 A silica replacement of the inner whorls showing the linear spiral 



sculpture, x 5 

 27, 28 Views of an internal cast showing the explanate aperture. Parts of 

 Orbiculoidea are attached to the specimen 

 Grande Grlve limestone. Grande Greve 



Coelidium egregium (Billings) 



Page 152 



29 Billings's type \op. cit. pi. 5, fig. 7] ■ • 



30 One of Billings's originals. " Head of the Falls of the Dartmouth 



River" 



Coelidium hebe (Billings) 



Page 153 



31, 32 Internal casts in the usual condition of preservation of this shell 

 Grande Grlve limestone. Grande Greve 



287 



