542 



MR. 11. I. rOCOGK ON THE EXTERNAL 



Those on the carpus of the common pig are well known, and are 

 said to occur in both boars and sows, I figured and described 

 them as seen in a wild boar, Sus scrofa, but I subsequently failed 

 to find a trace of them in a sow of this species and also in a sow 

 of the Japanese species, /Sics leucovii/stax, and I similarly failed 

 in the case of a boar of the Indian species, Sus cristatus. 



I have had no opportunity of studying further the peculiar 

 glands in the feet of the male of Fotatnochoei'ios porcus, which I 

 described a few years ago (Proc. Zool. Soc. 1916, p. 747), and 

 can add nothing to the original account. 



Section TYLOPODA. 

 Family Oamelid^*. 

 The Muzzle. 

 The facial vibrissje in this family are so poorly developed as to be 



practically negligible. 



Text-figure 39, 



A. ^lotalavsul gliiiid of the Alpaca {Lama /jlama). ^ 



U. Mnzzlo of Lama huanacus with the lips spread and the nostrils 



dilated, 

 C. The same of L. victic/na with the lips only partially spread and 



the nostrils nearly closed. 



The muzzle has the upper lip completely cleft, the two halves 

 being freely movable and separated by a philtrum of naked skin, 

 which extends down to the premaxillary gum-pad against which 



* In all the examples of Lama that I have dissected, and in the one example of 

 Camelus dromedarius, I found the so-called '• water-cells " of the rumen packed 

 with food and not filled with water. They are no douht primarily " food-cells," 

 and secondarily become filled with water in Camelus when food is unobtainable. 



