1920 



TYPE AMMONITES— III 



CXXXIXc 



Fig 4, x 1.5 



Fig. 3, x 2 



f| *V* 



Fig. 1, x 2 



Fig. 2, X 2 



Ammonites biplex, Homoeomorph of 

 Fig. 1, Inner whorls of CXXXIXb, fine prorsicostae and constrictions 

 Fig. 2, Periphery, 2 ribs not divided ; Figs. 3, 4, suture-line, nahtlobe 

 short 



DICHOTOMOCERAS DICHOTOMUM, S. Buckman, 1919 



Prionodoceratan, dichotomum ; Genotype, Holotype 



[Oct. 1927] 



