1918 YORKSHIRE TYPL AMMuXI I ES—II CXVUIb 



P'g- 4 



tH&r 



Fig. 2 



Fig. i 



Fig- 3 



Ammonites dissimilis, Williamson, Chirotype 



(Brown 1849, Paratype — PI. xx*, f. 11 ?) ; The Manchester Museum 



Figs. 1, 2, 3, Nat. size ; Fig. 4, Suture-line x 3 



QUENSTEDTOCERAS WILLIAMSON I, nov. 



