THE CHIMPANZEES AND ORANGS. 167 
the Dyaks), that, having obtained two adult males and five adult females, Mr. Wallace 
regards them as a distinct species, and refers them to my Pithecus Morio. The females 
**so exactly correspond with Prof. Owen’s figure, that there is no doubt of their belonging 
to the same species, the adult male of which will,’ Mr. Wallace believes, ‘‘ now be 
made known for the first time” (p. 474). 
The skins of the two small males and of the females were sent, in spirits, together 
with the skulls, in order to serve for the determination ‘‘ of the characters of the two 
species of Bornean Orang, Simia Satyrus and S. Morio” (p. 475). 
The skins and skulls of an adult male and an adult female of the Pith. Morio have 
been secured for the British Museum. The skulls of the other adult male and female 
Pith. Morio are now, through the kindness of Mr. W. Stevens, to whom Mr. Wallace 
consigned his collections, exhibited, together with the skulls of an adult male and adult 
female of the Pith. Satyrus, to the present Meeting of the Zoological Society (December 
9th, 1856). 
Mr. Wallace briefly records the height of the two male Morios shot by him, which 
were respectively 3 feet 83 inches and 3 feet 9} inches from the heel to the crown of 
the head, 6 feet 6 inches between the extremities of the outstretched arms, and about 
2 feet 6 inches in the girth of the body; they showed no trace of the cheek-excres- 
cences; the canine teeth ‘‘ were quite as large as in most specimens of the larger 
animal, and of exactly the same form ” (p. 474). 
This was the character I was most desirous of knowing, and the testimony to it, 
which we owe to Mr. Wallace, sets at rest the question of the sex of the individual, on 
the skull of which the species Pith. Morio was founded twenty years ago. 
I proceed now to the comparison of the skull of the adult male Morio (Plates XLIX. 
& L.) with one of the male Satyrus, of corresponding age, as indicated by the grinding 
surface of the molar teeth. 
By this indication both skulls have belonged to mature, but not to very aged, 
animals; the inner enamelled cusps of the first molar (m1), lower jaw, have impressed 
corresponding cavities on the inner side of the crown of the first molar above; and 
reciprocally, the two more produced outer cusps of that tooth have made impressions 
on the outer half of the grinding surface of the first molar (m1) below. In the Satyrus 
the like impressions may be seen, of less size, on m2 below, and the incisors have been 
more worn; but the crowns of the canines are almost entire, and the peculiar minutely 
wrinkled surface of the newly formed grinders of the Orangs is still retained on the 
last molars, as in the male Morio. 
The canines in the male Morio presenting, like the incisors and molars, an equality 
of size with those of the great male Pith. Satyrus, the small size of the skull and lower 
jaw supporting them is more remarkable than in the female skull. 
This difference is particularly marked in a comparison of the span of the zygomatic 
arches ; in the breadth of the cranium as compared with its length ; in the greater ex- 
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