182 MR. R. I, POCOCK OX THE EXTERNAL 



Finally, I must express my regret that, when writing on 

 the glands in 1910, I inadvertently omitted to consult and 

 quote Caton's valuable work on the deer of North America. 

 In this he fully described the glands and other external 

 characters of the species of that country, including those now 

 known as Rangifer tarandus, Aloes alces, Odocoileus rirginianus, 

 0. columbianus, 0. hemionus, and 0. acapulcensis, the last- 

 mentioned being regarded at the present time as a subspecies of 

 0. virginianus. 



To Oaton also we owe, I believe, the discoveiy of the very 

 remarkable fact that in Odocoileus the sheath of the penis, instead 

 of being confluent with the skin of the abdomen, so that the 

 short prepuce is situated about halfway between the groin an<l 

 the umbilicus, is long, pendulous, quite free from the skin of 

 the groin, except at its base, which is close to that of the 

 scrotum. 



Genus Oervus Linn. 

 Cervus elaphus Linn. (p. 941). 



The feet and glands of a second specimen are identical with 

 those described in 1910. 



The rhinarium has the inf ranarial portion mesially sulcate and 

 slightly narrower than the area between the nostrils ; it is not, 

 however, visible in profile view, owing to the forward extension 

 of the hairs of the upper lip. On the upperside the hairs of the 

 muzzle encroach in the middle line some distance beyond the 

 posterior angle of the nostrils. The buccal and ocular vibrissa 

 are well developed ; the interramal tuft is represented by a single 

 vibrissa and the genal tuft by two placed close together and set 

 halfway between the line of the mouth and of the eye, beneath 

 the posterior angle of the latter. 



Oervus canadensis Erxl. 



The rhinarium resembles tolerably closely that of C. elaphus, 

 except that the upper surface is more overgrown with hair, 

 which extends nearly as far as the anterior border of the nostrils, 

 and the infranarial portion is also narrower, being much narrower 

 than the area between the nostrils, owing to the forward and 

 inward extension of the hairs of the upper lip. (Text-fig. 2, 

 A, B.) 



The Asiatic Wapiti (CWvus xanthopygus) has a very similar 

 rhinarium. 



In these two species of Cervus the rhinarium is more reduced 

 by hair-growth from the muzzle than in any of the typical deer, 

 except Dama, although these genera are surpassed in that respect 

 by A Ices and Rangifer, 



