GUELPH FAUNA IN THE STATE OF NEW YORK 



149 



PLATE 5 



123 5 ~B 



00-00 



Modiolopsis sp. 



'1C. 



1 Internal cast of left valve. X2 



2 Same of a right valve, showing posterior cartilage pit. xa 



3 Internal cast of a larger individual with suborbicular 



outline. X2 



5 Internal cast of a small, more oblique specimen with long 



posterior wing, xa 

 All are from the Guelph at Rochester (Arey collection) 



Pterinea subplana Hall (sp.) 



Page 49 



4 Internal cast of a left valve, natural size. Upper Shelby 



bed (N. Y. State Museum) 



Pterinea undata Hall (sp.) 



Page 50 



6 Internal cast of a left valve. X2. Upper Shelby bed (N. Y. 



State Museum) 



