1926 



TYPE AMMONITES— VI 



DCLV 



Fig. I 



FlK. 2 



Ammonites attenuatus, Simpson, 1855, Holotype 

 Foss Yorks. Lias, 51, 54 ; Peak [near Whitby], Yorkshire 



Upper Lias, [Jet Rock] ; Whitby Museum, No. iii 

 S. 15, 36, 30, 40 ; 26, 34, 25, 42 ; max. c. 27 

 Ribs arched over venter ; several ribs entire 



MICRODACTYLITES ATTENUATUS, Simpson sp. 

 Harpoceratan, exaratum. Cf. CLVII 



