Oil the Deer of the West Coast of South America. 161 



One of the specimens is a male with the penis exserted, 

 which is of quite different form from that of L. perocellata. 

 The penis is ovate, lobed and hooked on the edge, folded to- 

 gether, ending in a broad, oblong, triangular hard claw, with 

 a groove on its underside ; the two sides of the expansion 

 are folded, but not exactly in half, so that the fold is on one 

 side of the terminal claw. There is a distinct groove at the 

 base, with raised edges, whicli fork off to each side a little 

 above the base, and which again fork off on each of its sides 

 just above their base ; and on the end of one side of each groove 

 are a couple of small, more or less hard, curved hooks. The 

 end of the tail is tapering, acute, and hard. 



XXIII. — On the Deer of the West Coast of South America, 

 with the Description of a new Species from Peru (Cervua 

 Whitelyi). By Dr. J. E. Gray, F.R.S'. &c. 



Mr. Whitely, Junior, has sent to the British Museum from 

 the mountains of Peru the skull of an adult female, and the 

 skull of a young smaller deer from the valley of Cosnipata, 

 which, from its having rudimentary canine teeth, is perhaps 

 that of a male. The skins belonging to these skulls Avcre 

 destroyed in the journey from the Indian country to Cuzco, 

 he having been caught in the rain. 



These skulls, and the other skulls of deer from the west 

 coast of America, distinctly show that there are four deer, 

 besides the Pudu [Gervus chileyisis), which inhabit the Cor- 

 dilleras from Patagonia to Peru, specimens of the skulls of 

 which are all in the British Museum — and most distinct from 

 each other, differing in the general form, size, and depth of 

 the preorbital pit, and in the form and size of the intermaxillary 

 bone. 



It is to be observed that the two skulls of the adult female 

 Xenelaphus in the Museum have well-developed, very slender, 

 rudimentary canines ; so that the existence of canines is not a 

 certain mark that the skulls belong to the male sex. Canine 

 teeth are observed in the two sexes oi Xenelaphus, and in the 

 skull of Cerviis Whitelyi] I see no indication of the canine 

 teeth in the skulls of the male or female Huamela leucotis or 

 in those of Furcifer antisieiisis in the British Museum. 



The Peruvian Roebucks may be thus defined : — 



1. Xenelaphus chilensis. 

 On recomparing the skull of the female from the Andes 

 Ann. & Maxj. N. Hist. Ser. 4. Vol xii. 11 



