﻿Description of Plate IV. 



r,'- ,-, , PAGE. 



rig. i. Lolpoceras arcuatuni, n. sp 242 



a. Dorsal view of type specimen, showing upward curvature of septa. 

 /'. Ventral view of same, showing downward curvature of septa. 

 Collection of ("in. Soc. Nat. Hist. 



Fig. 2. Gomphoceras powers!, a. sp. Collection of.C. L. Faber, ]r 255 



Fig. 3- Cyrtoceras faberi. n. sp 246 



a. Showing upper surface of type specimen. 



b. Same, cut longitudinally, showing curvature of septa. 



Collection of C. L. Faber, Jr. 



Fig. 4. Orthoceras hindei, U. V. James 241 



a. Showing upper surface of typical example. 

 Ik Under surface, showing form of siphuncle. 

 . c. Another example, showing structure of siphuncle. 



d. End view, showing cross section, the lower half being invariably 

 absent. 



Collection of F. P. Fames. 



