1912 



YORKSHIRE TYPE AMMONITES 



Fig. 2 



Ammonites heterogenes, Young & Bird, 1828 



Whitby Museum, No. 195, Holotype,— Figd. PI. xiv f 7 



Fig. I, Side view; Fig. 2, Apertural view (outline) 



ANDROGYNOCERAS HETEROGENES, Young & Bird sr 



