on Troglodytes Niger. 369 



from the heel. In this as in some other particulars, it would 

 seem that the animal has been confounded with the Orang 

 Outang, or Red Ourang of Asia. I am inclined to think 

 that the insertion of the thumb will be found to be an impor- 

 tant specific character in the Chimpanzee. It will be per- 

 ceived also that the remark of Cuvier that ' the cranium re- 

 treats from the crest of the eyebrow ' is incorrect ; the great 

 projection of the superciliary ridges in the Chimpanzee con- 

 stituting a strong mark of difference between it and the 

 Ourang." 



Osteology. 



The memoir of Professor Owen,* which has already been 

 so frequently referred to, contains so full and complete a 

 description of the osteology of the Chimpanzee, that it will 

 be only necessary, to point out some of the peculiarities, in 

 which the specimens which I have had an opportunity of ex- 

 amining, differ from the descriptions given by him. The 

 differences which have been noticed, may without doubt, be 

 for the most part attributable to age, yet, even in this point of 

 view, they will unquestionably not be regarded as destitute of 

 interest, inasmuch, as they detract somewhat from the value 

 of the specific characters of secondary importance, established 

 by Professor Owen. 



Crania. The observations upon and measurements of the 

 crania, are drawn from two adult specimens, one of which, 

 forms a part of Dr. Savage's collection, and for the other I 

 am indebted to the kindness of Dr. J. C. Warren. The third 

 specimen was that of an immature subject, the skeleton of 

 which was deposited in the Society's Collection by Dr. 

 Winslow Lewis, Jr., by whom it was prepared. 



No. I. Adult. In its general conformation corresponds 

 with Professor Owen's description, the bony covering of the 

 brain having an ovoidal form, broadest behind, smooth on its 

 superior and lateral faces ; the temporal depression which 



* Op. cit. vol. i. p. 343. 



