1923 



TYPE AMMOM'IES—IV 



CCCLXn' B 



Fi£ 



Fiii. I 



Ammonites silphouensis, Young cV Bird, 1S22, Holotype 

 Geol. Yorks, 250, 327 ; xii, 5 ; Silphoue Moor, Yorkshire 



Calcareous sandstone below the Corallian] oolite ; 

 Whitby Museum, no \o. ; S. (242, 26, 18, 46) ? max. c. 300 



ASPIDOCERAS SILPHOUEXSE, Young Cv- Bird sp. 

 \'ertumniceratan, silphouense 



