372 



MR. 11. I. rOCOCK ON THE EXTERNAL 



Octodon, whicli have the other vibrissse well developed, although 

 in Ctenomys the my«tacials are shorter than in the other genera 

 of OctodontidoB above quoted. In the examples of Gapi^oniys, 



Text-figfure 3. 





A. Muzzle and mouth of Mijocastor eoi/pu, from the front : p, palatal flaps 

 fused behind upper incisor teeth; Z, lingual flap. X J. 



iS. The same of Coelogenys paca. Lettering as in A, with o, orifice of external 

 cheek-pouch. X -J. 



C. Rliinarium and upper lip oi Lagostonms tricliodacti/lvs, from dried skin. X A. 



D. ThB smwi oi Dolichotis patagonica. X ^. 



Coenclu*, and Erethizon examined the interramal is also absent, 

 and the same is true of all the adult specimens of Myocastor. 



* In C.^preliensilis the fore and hind linihs and the lower portion of the sides of 

 the bod.v are provided with a few long scattered tactile vibrissse recalling those 

 on the body of Hi/ rax {Procavia). 



