ANATOMY OF THE ANTHROPOID APES. 217 



examination, the black colour could be rubbed off, staining the fingers. I am uncertain 

 whether to regard it as pathological ; if normal, it would strengthen the reasons for 

 regarding this animal as a distinct species of Orang. 



IV. EXPLANATION OF THE PLATES. 



PLATE XX. 



Head of Troglodytes calvus, drawn after death in August 1891 : fuU face, natural size. 



PLATE XXI. 



Troglodytes calvus, head of the same animal, viewed vertically from above, natural 

 size. 



PLATE XXII. 



A hand and foot of the same, palmar surface, natural size : Fig. 1. Hand ; Fig. 2.. 

 Foot. — The letters refer to the lines on the palm of the hand and on the 

 sole of the foot, which are described in the text. 



PLATE XXIII. 



Brain of the same, natural size. 

 Fig. 1. Lateral view of right side. 

 Fig. 2. Lateral view of left side. 

 Fig. 3. Brain, viewed from above. 

 Fig. 4. Brain, viewed from the underside. 



F.s. Sylvian fissure ; F.s.a. Anterior branch of Sylvian fissure ; Po.f. Parieto- 

 occipital fissure ; F.R. Fissure of Kolando. 



PLATE XXIV. 



Head of young Orang " George," natural size. 



PLATE XXV. 



Fig. 1. Head of the same, viewed vertically from above. 



Fig. 2. Palate of Troglodytes calvus (" Sally "), to illustrate the ridges. 



Fig. 3. Palate oi Simia satyrvs{1) ('-George'"). 



PLATE XXVI. 



Upper surface of hand and foot of Orang (" George ") : Fig. 1. Hand ; Fig. 2. Foot. 

 TOL. XIII. — PART V. No. 6. — February, 1893. 2 1 



