1920 



TYPE AMMONITES— III 



CXXXIXb 



Fig. 2 



Fig. i 



x 0.9 



Ammonites biplex, Homoeomorph of 



Fig. 1, Left side of CXXXIXa, with much test, showing stout ribs 



bordering constrictions ; body-chamber from x complete ? 



Fig. 2, Peripheral view, ribs strong 



DICHOTOMOCERAS DICHOTOMUM, S. Buckman, 1919 



Prionodoceratan, dichotomum ; Genotype, Holotype 



[Oct. 1927] 



