1910 



YORKSHIRE TYPE AMMONITES 



XIII 



Fig. I 



Ammonites lythensis, Young & Bird, 1828 

 Whitby Museum, No. 208, Holotype 

 Fig. I, Side view ; Fig. 2, Apertural view ; both x 0.92 



PSEUDOLIOCERAS LYTHENSE, Young & Bi 



RD SP. 



