1913 



YORKSHIRE TYPE AMMONITES— II 



XC 



Fig. i 



Fig. 2 



Ammonites vorticellus, Simpson, 1855 



Whitby Museum, No. 154, Holotype 

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



PORPOCERAS VORTICELLUM, Simpson 



sp. 



