200 LLOYDS NATURAL HISTORY. 



spicuous in A. troglodytes. The hair is blacker than in the latter 

 species, and extends only for a short distance in front of the 

 level of the ears, and on the sides of the face ; the temporal 

 region and cheeks show a scanty growth ; on the chin and 

 upper lip a sparse crop of short hairs, chiefly white; long 

 scattered black eyebrows, which do not meet in the mid-line, 

 spring from the supra-orbital ridges. The ears are as large 

 as in A. troglodytes^ very flat, but stand out more prominently 

 from the side of the head; their margin is nude, and there is 

 no lobule. The hands are haired across the knuckles, and again 

 (after a naked band) on the back of the hand and arm ; the 

 foot is haired down to the first joints of the toes ; the nails 

 and fingers are very human in appearance. 



Face very prognathous ; the nasal bones ridged in the mid- 

 line ; the foot less like a human hand than even in the Orang. 

 " Sally's" brain weighed 8f ounces. 



The expression of the face, the expanded nostrils, the thicker 

 lips, especially the lower lip, and the more elevated skull, all dis- 

 tinguish A. calvus from A. troglodytes ; in its muscular anatomy 

 and in its brain it also shows points of difference. 



Distribution. — The interior of Gaboon, in Western Africa. 



Habits. — The Bald Chimpanzee showed in captivity a dis- 

 position to live on animal food, which the Common Chimpanzee 

 never does. " Sally " had also the singular habit of producing 

 pellets, resembling the castings thrown up by Raptorial birds ; 

 they were composed of feathers (of the birds she had eaten) and 

 other indigestible substances taken with her food. Moreover, 

 "Sally," as this Chimpanzee, now famous in the annals of 

 zoology, was named, was an expert rat-catcher, and caught and 

 killed many rats that entered her cage. " Her intelligence was 



