GUELPH FAUNA IN THE STATE OF NEW YORK 167 



10. 



8 An individual with strong subequal longitudinal ribs. From 



a gutta-percha impression 



Originals of fig. 5-8 are from the Lower Shelby bed (N. Y. 

 State Museum). 



Orthoceras rectum Worthen 



Page 78 



9 Internal cast of a large specimen, showing the great depth of 



the camerae. Lower Shelby bed (N. Y. State Museum) 



