538 



MR. E. I, POCOCK ON THE EXTERNAL 



The Facial Vibrissa}. 



The full complement of facial vibrisssa characteristic of the 

 Mammalia can sometimes be detected in the Suida3, but I have 

 failed frequently to trace the genal tufts, owing to their being 

 either suppressed or indistinguishable in the tliick clothing of 

 coarse hair which generally covers the cheek. The mystacials 



Text-figure 36. 



A. Side view of head of Potamochcerus porcus showing facial vibrissas. 



B. The same of Dicotyles pecari. 



C. Base of the ear of P. porcus. 



are relatively short and scattered, and apparently of less import- 

 ance than the others, probably on account of the prominence and 

 sensitiveness of the specialized rhinarium. The lower lip is 

 always provided with scattered submentals approximately as long 

 as the mystacials ; but the superciliaries and suboculars are 

 always long and plentiful as if the protection of the eye was of 

 importance. Typically the interramal tuft is composed of about 

 half a dozen moderately long vibrissse. 



