GUELPH FAUNA IN THE STATE OF NEW YORK 1 65 



'IG. 



5 Section through lower part of individual represented in fig. 2, 



showing the curvature and depth of camerae and slightly 

 expanded siphuncle. 



Kionoceras darwini Billings (sp.) 



(See plate 10, fig. 22; plate 12, fig. 1-8) 

 Page 84 



6 A very large individual, retaining the longitudinal ribs to 



mature age. From a gutta-percha squeeze of a natural 

 impression 

 All figures are natural size. All originals are from the Lower 

 Shelby bed (N. Y. State Museum). 



