16 MAMMALIA. 



jjj. A dried right hand. No history. Marki^d 3ooo. 

 khh. A preparation of penis of the 3a, displaying the penial 

 bone 0"-50 in length, situated in the distal end of the 

 organ. 



The foregoing seven skeletons from Borneo, presented to 

 the Asiatic Society of Bengal by Sir James Brooke, were 

 described by Mr. Blyth in 1855, three as males and four as 

 females, and he remarked, ' " There is no reason to doubt 

 the correct determination of sex in any of the specimens." 

 To one, however, conversant with the great differences in 

 size and form that exist between the skulls of ohe two sexes 

 of Orangs there is every reason to doubt that any of them are 

 females. The skulls of these skeletons are all distinguished 

 by the characteristic features of the male sex, great size, 

 strong muscular ridges, and huge canines, and 'all present a 

 common likeness to the skull 3a, which is certainly known 

 to be tlie skull of an adult male Orang-outang, which in life 

 was distinguished by the enlargement of his cheeks into huge 

 bare excrescences. 



The variations presented by these skulls in the extent to 

 which the external margins of their orbits are developed, the 

 breadth across their orbits, the form of the orbits, the length of 

 the muzzle, the degree of concavity of the profile, the zygoma- 

 tic breadth, the degree of convergence of the temporal ridges, 

 the arch of the frontals and of the parietals, the length, depth, 

 and form of the palate, the depth of the symphysis, the height 

 and breadth of the ascending ramus of the lower jaw,, and the 

 dimensions of the teeth, are very great and amjjly justify 

 the application to them of the remark made by Wallace ^ re- 

 garding the Orangs collected by himself in Borneo, that they 

 manifest differences as decided as those existinsr between the 

 most strongly marked forms of the Caucasian and African 

 crania in the human species. 



When Mr. Blyth catalogued the mammals in the Museum 

 of the Asiatic Society of Bengal,^ the only two adult female 

 Orangs then existing in the collection, he referred to the sup- 

 posed species S. morio, Owen,* which was founded on a female 

 Orang skull, whereas all the males were referred by him to 

 S. satyrus. Two adult, or nearly adult, females have beea 



1 Jonrn. As. Soo. Bengal, Vol. XXIV, 1855, p. 518; oy. cit., p. 528. 



5 Add. and Mag. Nat. Hist., Vol. VII, 1856. p. 472. 



» Cat. Mamm., As. Soc. Mns., Vol. V, 1863, p. 4. 



* Trans. Zool. Soc. Lend, 1841, Vol. II, p. 168, pis. 33 and 34. 



