PLATE i8 



Aviculopecten ? incrassatus nov. 



Page I5S 



1 The original, with broad unequal concentrically lined ribs 

 Grande Greve limestone ; division 2. Lehuquet's Cove 



Pterinopecten proteus Clarke mtLtation 



Page 156 



2 The two valves In articulation 



3 A left valve 



Grande Greve limestone. Grande Greve and Indian Cove 



Aviculopecten sp. 



4 The interior of a right valve, probably not of the same species as the 



others 



5 Internal cast of a left valve 



6 Exterior of a right valve 

 Gaspe sandstone. Gaspe Basin 



Pterinea textilis arenaria (Hall) 



7 A nearly complete and finely preserved individual, drawn to show the 



characters of the exterior which have not before been correctly 

 represented 



Oriskany sandstone. Schoharie, N. Y. 



288 



