1928 



TYPE AMMONITES-VII 



DCCLXXIII 



Fig. i 



F««. 2 



Ammonites walcotii, J. Sowerby, 1815, Topotype 

 (Min. Conch, ii, 7 ; cvi) ; Whitby, Yorkshire ; Upper Lias 



[Alum Shale] ; S.B. Coll. 3250, purchased 



S. 68, 33, 24-5, 37; 98, 32, 215, 44; size 100; max. c. 102 



At end, injury reduces carinatibisulcation, produces riblets 



HILDOCERAS WALCOTTI, J. Sowerby sp. 

 Hildoceratan, bifrons. See DCLXXXV & CXlYu 



