1920 



TYPE A MMUMTES—I1I 



CLV 



Fig. i 



Fig. 2 



X 0.89 



Ammonites serratus ; Aoctt. 



St. Ives, Huntingdonshire ; Drift, ex Kimmeridge Clay] J.W.T. Coll. 



S. 124, 43.5, 32. 22.5 ; max. c. 190 



PRIONOCERAS PRIOXODES. now 

 Kimmeridgian, serratum ; Genotype, Holotype 



