GUELPH FAUNA IN THE STATE OF NEW YORK I 73 



FIG. 



10, 11 Internal cast of a large specimen, referred with doubt to this 

 species, possessing a strongly contracted living chamber 

 All figures are natural size. The originals of fig. 1-3, 6-9 

 are from Rochester (Arey collection); those of fig. 4-5, 10, 11 

 are from the Lower Shelby bed (N. Y. State Museum). 



