1922 



TYPE AMMOMTES—rV 



CCCb 



Fig. I 



rig. 2 



Stephanoceras crassizigzag 



Broad Windsor, Dorset ; S.B., ex Darell, Coll. 1157 



Fig. I. Secondary ribs appear to break up into costulae 



ZIGZAGICERAS RHABDOUCHUS, xov 

 Zigzagiceratan, poll k brum ; Holotype 



