252 



MERISTIC VARIATION. 



[part I. 



size and form of "p s ." In lower jaw, right side 3 interm. teeth ; 

 left side no interm. tooth. B. M., 1.936, j. 



*375. Specimen having two small premolars on each side between p]_ and 

 2^. The two teeth are very small and sharply pointed (Fig. 65). In 



III 



IV 



Fig. 65. Teeth of Phalanger orientalis. No. 375. 



I. Premolars of left upper jaw, surface and side views. 



II. and III. Right and left lower jaws as far as p*. 

 IV. The same in surface view. 



(From a drawing kindly sent by Dr Jentink.) 



the lower jaw there are on the right side five intermediate teeth be- 

 tween the incisor and pS and on the left side four such teeth (instead 

 of three as usual). Leyd. Mns. ,104, Jentink, F. A., Notes Leyd. Mus., 

 1885, vii. p. 90. 



* 



Statistics of the occurrence of small Pjwnolars and lower 



" Intermediate " teeth in Phalanger orientalis and 



Phalanger maculatus. 



376. Phalanger orientalis. 



Statistics as to the absence of the small "p*," and as to the number of the 

 "intermediate" teeth, may conveniently be given together in tabular form. The 

 species has a wide distribution and is by Thomas divided into a larger var. typicus, 

 and a smaller eastern var. breviceps. In the latter the small p 3 is usually absent. 

 The Leyden specimens are not thus divided by Jentink, and in order to include the 

 statistics given by him (/. c.) the distinction into two races is not followed in the 

 table. 



When present, "j; 3 " generally stands at an even distance from p 1 and p i , as 

 in the left side of Fig. 64, C, and not as in the left side of Fig. 64, A. The 



