B54 



the width at th© widest part of the brain -case 1 foot fi inches ; the 

 length in a straight line, from the tip of the rostrnm to the crest 

 over the blower, 2 feet 11 inches ; the height of the skull, from the 

 hinder part of the palate to the crest over the blower, 1 foot 2 inches. 



Fig. 72. 





a, b. Skull and lower jaw of Ziphius Layardii. 

 from front. 



c. Teeth of lower jaw, 



The entire length of the lower jaw 3 feet ; the length from the con- 

 dyle to the hinder edge of the base of the tooth 1 foot 11| inches; 

 the length of the exposed part of the tooth along the anterior edge, 

 &^ inches ; the width, below the teeth, of the side of the lower jaw, 

 measured from the inner part of their base, 3 inches. 



There is a partial hollow, as if it were the cavity of an old tooth 

 that had fallen out, on the margin of the lower jaw, behind the base 

 of the elongated arched tooth. 



The skull which I described from the notes of Mr. Layard and 

 the drawing of Mr. Trimen under the name of Ziphius Layardii (see 

 Proc. Zool. Soc. 1865, p. 358) proves on examination, as I decided 

 from the notes and drawing, to be a very distinct species of the 

 genus, allied to Z. microjpterus. The peculiar form of the teeth 

 (which are elongated and arched over the outer surface of the upper 

 jaw, so as to prevent the animal from opening its mouth beyond a 

 very Hmited extent), it has been suggested to me, may be only an 

 individual pecuharity or a malformation. I scarcely think this is the 

 case ; but even if it should be, it will not in the least militate against 

 the distinctness of the species, as the proportion of the beak to the 

 size of the brain-case, and the form of the beak and position and 

 form of the teeth (with a small point near the front edge of the tip), 



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