1176 



MR. R. I, POCOCK ON THE EXTERNAL CHARACTERS 



hairs, forming a kind of mat, and projecting downwards and 

 backwards. The hairs of these pads meet in the middle line 

 over the tongue in front of the molar teeth, and close the orifice 

 of the throat. (Text-fig. 39, D.) 



The tufts of the facial vihrissce in all the genera of true 

 Squirrels, in the Sousliks and Marmots are normal in number 

 and position, the mystacials, supercilaries, and genals being long 

 and comparatively numerous and the interramals, though less 

 evident, being always detectable. The only variations to record 



Text-fie-ure 41. 



A. Head of Callosciurus prevosti, sliowing the tufts of vibrisssa charac- 



teristic of thf) Sciuridse. 



B. „ „ Geosciurus capensis, with additional tuft of superciliary 



vibrissss. 

 G. „ „ Gynomijs ludovicianus, the curved dotted Hue showing the 



size and position of the small cheek-pouch. 

 D. ., „ JSiitamias quadrivittatus, with the external wall of the large 



cheek-pouch cut open. 



are the absence of the interramal tuft in the Flj^ing Squirrels 

 (Petauristidse) and the presence in the Bristly Ground Sqviirrels 

 i^Xerus and its allies) of a supplementary superciliary tuft of 

 long vibrissas over the posterior angle of the eye. In this 

 particular these Grround Squirrels are unique, so far as I know, 

 amongst mammals. (Text-fig. 41.) 



The Bsavers have a few short, stiff mystacial and superciliary 

 vibrissDe, but the genal and interramal tufts are absent. In the 



