1918 



YORKSHIRE I YPE AMMONITES— II 



CXIX 



Fig. i 



Fig. 2 



Ammonites crassus, Young & Bird, 1828 



Whitby Museum, No. 125, Holotype 

 Fig. 1, Side view ; Fig. 2, Apertural view 



CCELOCERAS CRASSUM, Young & Bird sp. 



