the West Coast of South America. 163 



The skull of this species differs from that of Xenelaphus 

 chilensis in having a small, shallow, triangular pit in front ot 

 the orbit, and in the intermaxillary being narrowed above and 

 not reaching quite so high as the nasal bones. 



The skull of the female has no prominence on the side of 

 the head behind the orbit, as in the two preceding species. 

 The skull of the male, from the Society, has only rudi- 

 mentary anomalous horns, that of the right side being forked, 

 and of the left simple ; it is therefore impossible to compare 

 them with the figure of the horns given by D'Orbigny. The 

 front of the upper jaw between the intermaxillary bones is 

 much larger in the male than in the female ; the front edge 

 of the intermaxillary bone in the male is bifid, rugose on the 

 underside. The forehead between the eyes and horns in both 

 the male and female skulls is strongly keeled, the keel being 

 highest in the male. 



The reception of this skull from Peru proves that Dr. 

 Philippi was wrong, and probably misled by believing that 

 there was only one species of deer on the Andes instead of 

 four, when he observed (in Wiegmann's 'Archiv,' 1870) that 

 D'Orbigny's Cervus antisiensis was the same as Gay's Cervus 

 chilensis ; or at least this skull proves that there is another 

 species found in the Peruvian Andes distinct from Gay's 

 Cervus chilensis. 



Cervus ( ?) Whitelyi, n. sp. 



It is impossible to refer this skull from the valley of Cosni- 

 pata to any of the modern genera, as it is quite destitute of 

 any appearance of horns. It is the skull of a rather young- 

 animal, with only five grinders on each side, which yet appear 

 to be fully formed, and is unlike the skull of any South-Ame- 

 rican deer in the Museum collection, the brain-cavity being 

 much larger and more ventricose compared with the compressed 

 face than in any other known skull ; and it has rudimentary 

 canines, which are not to be observed in any species of Coassus 

 or smaller South-American deer. 



The skull is 6| inches long, and 3g inches wide in the lower 

 edge of the middle of the orbital opening (which is the widest 

 part of the skull), and 3f inches from the end of the occiput to 

 the front of the orbit, and 3g inches from the front of the orbit 

 to the end of the intermaxillaries. There is a rather elongate 

 groove over each orbit, as in the skull of Coassus nemorivagus ; 

 but the brain-case of this skull is very much narrower, and has 

 a keel in the centre of the forehead, which is entirely absent in 

 the flat broad forehead of Cervus Whitelyi. There is a 

 moderately deep, concave, rounded pit for the tear-gland, and 



11* 



