191 1 



YORKSHIRE TYPE AMMONITES— II 



XCVII 



Fig. i 



Fig. 2 



Fig- 3 



Fig- 4 



TlLTONICERAS COSTATUM, S. BUCKMAN 



Fig. i, Side view ; Fig. 2, Peripheral view of Holotype ; 



S. Buckman Coll. 

 Figs. 3, 4, Same views of Paratype ; J. W. Tutcher Coll. 



TlLTONICERAS COSTATUM. S. Buckman 



