GUELPH FAUNA IN THE STATE OF NEW YORK 



173 



FIG. 

 IO, II 



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, 1 1 

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



