7927 



TYPE AMMONITES— VI 



CLVllA 



I 



Fig. I 



Fig. 2 



Fig. 3 

 X i'46 



Ammonites tenuicostatus 



Whitby, Yorkshire ; Upper Lias [Grey Shales] ; S.B. Coll. 4712 purch. 



S. 44, 25"5, 25, 52 ; 66, 22"5, 20, 56 ; size c. 69 ; max. c. 90 



Inner whorls smooth. See T.A. vi, December, 1926, p. 41 



TENUIDACTYLITES TENUICOSTATUS, Young & Bmu sp., 1822 

 Harpoceratan, tenuicostatus ; Genotype. 



