544 



MR. II. I. POCOCK ON THE EXTERNAL 



and are lined for some distance inside with short luiir. (Text- 

 fig. 40, A, B.) 



'JHie complete cleavage of the upper lip by a philtrum, and the 

 mobility of its two halves inferiorly where they project below and 

 on each side of the premaxillary gum-pad, are characters of the 

 Tylopoda as remarkiibla as any that are usually cited as diagnostic 

 of that section of Arfciodactyla. 



The Occipital Gland o/Camelns. 

 In my paper on the Specialised cutaneous scent-glands of 

 Ruminants (Proc. Zool. Soc. 1910, p. 973), I described the 

 occipital gland of the two species of Camelus as observable on 

 the living animals. I there stated that there are a pair of such 

 glands. That was an error due to the interpretation of the gland 

 by touch. There is a single gland, about as wide as long and 



Text-figure 41. 



A. Tmnsvorso section of the occipital gland of Oamelus dromedarius. 



B. Longitudinal section of the same. 



C. Haso of eav of Lama vicugna. 



J). The same of Camelus dromedarius. 



covered with hair. It is composed of thickened skin, Avhich 

 gradually thins out marginally where it runs into the normal 

 skin at the back of the liead. Its lower half is rather thicker 

 than the upper, and in the middle there is a wide and tolerably 

 deep longitudinal depression, and it was the resulting biconvexity 

 of the gland which deceived me into thinking there were two. 

 (Text-fig. 41 , A, B.) 



