28 



MR. R. I. POCOCK ON THE EXTERNAL 



slightly overlaps when laid forwards. It can be extended at right 

 angles to the long axis of the palm, but is not truly opposable 

 since the large composite palmar pad — the u ball " of the thumb — 

 at its base is almost stationary. The succession of the digits in 

 length is 4, 3, 5, 2, but the fourth only exceeds the third slightly, 

 and the second and fifth are approximately equal. The palm is 

 longish, longer than wide, and passes proximally beyond the base 

 of the pollex. Of the four interdigital pads, the first or pollical 

 is confluent with the inner proximal (thenar), constituting the 

 " ball " of the thumb. The remaining three interdigitals form 

 a transverse trilobed cushion-like pad. Behind the fourth or 

 external interdigital, the external portion of the palm is occupied 



Text-figure 4. 



A. Foot and B. Hand of Lemur macaco ; X f . 



1, 2, 3, 4, the intermediate pads ; I, II, the proximal pads. 



by the elongated external proximal (hypothenar) pad, which is 

 subdivided, the posterior expanded portion lying alongside the 

 posterior portion of the " ball " of the pollex, from which it is 

 separated by a groove (text-fig. 4, B). 



In its main features the hand only varies in minor particulars 

 in the different species examined, namely, L. catta, macaco, albi- 

 frons, mo7igoz, variegatus, and coronatits, except that in L. varie- 

 gatus the palm is a little wider as compared with its length. 



In the foot the hallux is of great length and thickness, is 

 capable of being extended at right angles to the sole, and is 

 opposable, the " ball " of the hallux, consisting mainly of the 

 large, projecting first or hallucal interdigital pad, being movable 



