THE NATURALIST, 1909. 



Plate XV. 



Harpoceras mulgvaviiim. From photograph of Young and Bird's 

 original type specimen of Am. nmlgravius. 



Block, the copyright of Mr. S. S. Buckman, Photographed by Mr. 

 J. W. Tutcher, Bristol. (Reduced to about J nat. size). 



