1 78 



NEW YORK STATE MUSEUM 

 PLATE 18 



Gyroceras farcimen sp. nov. 



Page 92 

 FIG. 



1-3 Three views of an internal cast, showing the sutures, depth of 

 camerae, position of siphuncle and circular section of conch 



4 Fragment, showing the curvature of the conch and the smooth 



surface. From a gutta-percha impression of a natural mold 



Cyrtoceras bovinum sp. nov. 



(See plate 16, fig. 8, 9) 

 Page 90 



5 Specimen retaining the surface sculpture 



6 A large individual, showing the curvature and expansion of 



the conch, direction of sutures and depth of camerae 

 All figures are natural size. The originals of fig. 1-4 are 

 from the Lower Shelby bed (N. Y. State Museum) ; those of 

 fig. 5, 6 from Rochester (Arey collection). 



