28 A dorsal \al\c 



(iaspc sjiuislonc. Gaspe Basin 

 27, 29 X'entral and dorsal valves 



30 A large shell, of a type common in certain layers 



Grande Grcvc limestone ; division 2. Grande Greve and Indian Cove 



Sieberella galeata (Dalman) 



Page 108 



31 A dorsal valve exposing part of the spondylium 



32 A small ventral valve 



St Alban beds. Cape Rosier Cove 



311 



