1918 



YORKSHIRE TYPE AMMONITES— II 



CXIII 



Fig. 2 



Fig i 



F'g- 3 



Ammonites rotifer, Williamson 1838, Chirotype 



Brown 1849, Holotype — PI. xx*. f. 14, 15 ; The Manchester Museum 



Fig. 1, Side view ; Fig. 2, Apertural view ; Fig. 3, Peripheral view 



PERISPHINCTES ROTIFER, Williamson-Brown sp. 



