132 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



ruginous (rostroth). The hair on the upper part of the neck has a length 

 of 22 mm., on the middle of the back, 18 mm., and on the middle of the 

 belly, 11-12 mm. The thick, smooth-lying short hair on the dorsal 

 surface of the fore limbs extends only to the middle of the hand and basal 

 portion of the phalanges, which are tipped with very small nails. The 

 distribution of the hair on the upper surface of the hind limbs is the same 

 as on the fore limbs. The nail on the outer toe of the foot is small, flat 

 and short; that on the inner toe somewhat longer. The three middle 

 toes have well developed nails. The skin flap at the end of the toes is 

 largest on the outer toes and smaller on the middle toes, being broadest 

 on the outer toe. 



Total length from the end of the nose to the end of the tail, 1570 mm. ; 

 length of the ear 36; length of the tail, 35 ; length of the palm, 300; 

 length of the sole, 350 ; length of the membrane on the middle toes, 90- 

 105; length of the skull, 235. (For further cranial measurements see the 

 table under ^. aiistni/is, p. 128.) 



The specimen described by Dr. Peters, as summarized above, is a young 

 adult male, as shown by the illustrations of the skull, in which the sagittal 

 crest is only slightly developed. The ear is apparently a little shorter 

 than in A. aitstralis, but in other respects there are no very marked ex- 

 ternal differences between A. aiisfni/is and A. philippii. 



Skull. — Skull long and narrow, the posterior part much narrower than 

 in A. imstralis, though the skull as a whole is much longer; rostral por- 

 tion also narrower, longer and much more sloping; nasals about one 

 third longer and much narrower ; dentition much heavier, and the acces- 

 sory cusps generally wholly absent or rudimentary; palate nearly flat, 

 not vaulted as in A. aitstralis ; sagittal crest strongly developed, reaching 

 a height of 28 mm. in old males and extending forward to the postorbital 

 processes, as in Zalopluis, and reaching as great a degree of development. 



Geographical Distn'bnlioii. — The type locality of Arctoceplialus pliilip- 

 pii is the Island of Juan Fernandez, off the Coast of Chili. In the mate- 

 rial at present available there is a single skull labelled as from the Straits 

 of Magellan, and one from "Patagonia," probably Paraca Bay ; all of the 

 other eight skulls are from the Galapagos Archipelago, two being from 

 Jarvis Island and six from Hood Island. It would thus appear that 

 Artoceplialtts philippii ranges from the Straits of Magellan northward 

 along the west coast of South America to the Galapagos Archipelago. 



