52 



THE VOYAGE OF H.M.S. CHALLENGER. 



the skull was 202 mm.; if 90 mm. be allowed for the missing vertebrae then the combined 

 leno-th of skull and spine would be 1392 mm. or 4 ft. 6 in. The length of the spine, 

 including the dried intervertebral discs, of the larger Kerguelen Island Fur-Seal was 

 1110 mm., that of the skull was 212 mm., giving a total length of 1322 mm. 

 or 4 ft. 3 in. Mr. H. E. Elliott in his account of the Northern Fur-Seal of the Pribylov 

 Islands (Callorhinus ttrsinus) states 1 that the male, when fully mature and fat, weighs 

 on an average from 400 to 500 pounds, while the female gives a mean of from 80 to 85 

 pounds. Mr. Allen gives the length of the skeleton, including the skull of an adult 

 male ursinus, as 2040 mm. (6 ft. 7 in.); and of another as 1840 mm. (6 ft. ^ in.); whilst 

 one adult female measured 1370 mm. (4 ft. 5 in.); and another 1215 mm. (3 ft. 10 in.). 



It would appear therefore that the Northern Fur-Seal, especially the male, is a 

 somewhat longer and probably more bulky animal than the Fur-Seal which frequents 

 the southern half of the South American continent. 



The length-breadth indices of five male skulls of Arctocephalus australis, 

 calculated on the width behind the external meatus, were respectively 55 - 8, 59, 50, 

 58 - 9, and 51, and of the female 52 - 9 ; but at the interzygomatic width the indices for 

 three males were respectively 63"5, 57, and 59, and for the female 57'4. The length- 

 breadth indices of the skulls from Kerguelen Island, calculated on the width behind the 

 external meatus, were respectively 56'6 and 51 - 6, and on the interzygomatic width 

 617 and 56 - 8 respectively. 



Arctocephalus, sp. incerta. 



Fur- Seal from Juan Fernandez. 



This specimen from its size was obviously a very young pup. It was given alive to 

 Sir Wyville Thomson at Juan Fernandez, but died after being a few days on board ship. 

 The animal was preserved in strong spirit. Its principal dimensions are as follows : — 



Table VIII. — Fur-Seal from Juan Fernandez. 



1 The Seal Islands of Alaska, a memoir issued by the Department of the Interior, Washington, 1881 ; and in his 

 buok, An Arctic Province, Alaska and the Seal Islands, London, 1886. 



