1913 YORKSHIRE TYPE AMMONITES— II LXXVIII 



Fig. 



Fig. 2 



Fig- 3 



Ammonites gagateus, Young & Bird, 1828 



Whitby Museum, No. 104, Holotype 



Fig. I, Side view ; Fig. 2, Peripheral view ; Fig. 3, Suture-line, x 4 



GAGATICERAS GAGATEUM, Young & Bird sp. 



