1911 



YORKSHIRE TYPE AMMONITES 



XXXI 



Fig. I 



Fig. 2 



Ammonites semicelatus, Simpson, 1843 



Whitby Museum, No. 116, Holotype 



Fig. r, Side view, nat. size ; Fig. 2, Apertural view, slightly reduced 



DACTYLIOCERAS SEMICELATUM, Simpson sp. 



