1910.] 



The Skulls of Tupaia and Ptilocercus. 



273 



processes of the frontal and malar have not yet met and this region also is 

 accordingly less specialized than in Tupaia. 



fos.ecipt. 



.en.ty. 

 -petP 



cr. tntp. 



^;arvr^'"<..;.As.',A, 



A 



Kig. 21. Skull and lower jaw of Ptilocercus lowii Gray. U. S. Nat. Mus. No. 112611. 

 X f. Ai, palatal view, A2, side view. Abbreviations as in Fig. 18, p. 243. 

 en.ty., entotympanic; Ty., ectotympanic. 



Amid all these differences the skulls of Tupaia and Ptilocercus reveal 

 their family relationship not only in the details cited above (p. 272) but espe- 



