PLATE 36 



Brachyprion majus Clarke 



Page 190 



I Partial exterior of a ventral valve 

 2, 3 Interior of dorsal valves 



4 Enlargement of surface sculpture, x 5 



5 Internal cast of large ventral valve 



6 Sculpture cast of ventral valve showing the normal character of the 



surface 

 Grande Greve limestone ; division 2. Grande Greve 



Leptostrophia oriskania Clarke 



Page 194 



7, 9, 12, 14, 15, 18 Exteriors of ventral valves showing the variations in 



the aspect of the exterior 

 8 Exterior of a dorsal valve 



10 Internal cast of ventral valve 



11 Interior umbonal portion of a ventral valve, x 2 



13 Exterior of a dorsal valve with oblique crenulations at the cardinal 

 angles 



16 Enlargement of the surface 



17 Interior of a dorsal valve 



Grande Greve limestone ; division 2. Grande Greve 



Leptostrophia blainvillii (Billings) 



Page 237 



19 Internal cast of a ventral valve 



20 Interior of a ventral valve 



21, 22 Exteriors of ventral valves 



23 Interior of a dorsal valve 



24 Exterior of a ventral valve with attached Hederella blainvillii 

 Gaspe sandstoen. Gaspe Basin 



324 



