19W 



YORKSHIRE TYPE AMMONITES 



XXIII 



Nautilus subcarinatus, Young & Bird, 1822 



Whitby Museum, No. 63, Holotype — Specimen Figd. PI. XII, f. 7 



Fig. I, Side view ; Fig. 2, Apertural view 



FRECHIELLA SUBCARINATA, Young & Bird sp. 



