THE NATURALIST, 1909. 



Plate XV. 



Harpoceras miilgvaviam. From photograph of Young and Bird's 

 original type specimen of Am. niulgraviits. 



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

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



