1926 



TYPE AMMONITES— VI 



DCLXXXIII 



Fig. I 



Fig. 2 



Fig 3 



Ammonites fibulatus, J. de C. Sowerby, 1823, Topotype 



(Min. Conch, iv, 147, ccccvii, 2) ; Whitby, Yorkshire ; Upper Lias 



[Alum Shale, Cement Shale] ; S.B. Coll. 3809, p.urch. 



S. 53, 24, 23, 49; 77, 22-5, 22, 57; max. c. 80 



PERONOCERAS FIBULATUM, J. de C. Sowerby sp. 

 Hildoceratan, fibulahnn. Cf. DCLVIII 



