376 MR. R. OWEN ON THE OSTEOLOGY OF 
PLATE XLVIII. 
Side view of the skeletons of the adult and young Chimpanzee (Simia Troglodytes, 
Blum.), the latter being of that age when the first permanent molares have been ac- 
quired, and before the shedding of any of the deciduous teeth. 
PLATE XLIX. 
Side view of the skeletons of the adult and young Orang Utan (Simia Satyrus, Linn.). 
The young skeleton is of a corresponding age with that of the Chimpanzee in the pre- 
ceding Plate: like it, it exhibits the anthropoid character in the relative smallness of 
the face to the cranium, resulting from the state of dentition, but shows the corre- 
spondency with the adult skeleton in the number of ribs and in the relative proportions 
of the upper and lower extremities. With regard to the number of vertebre, it must be 
observed, that the figure of the adult skeleton, being taken, by permission of the Board 
of Curators, from the specimen in the Museum of the Royal College of Surgeons, ex- 
hibits the abnormal number of five lumbar vertebrae, instead of four, which is the number 
existing in the trunk of the mature Orang preserved in the Museum of the Zoological 
Society and in the skeleton in the Museum of Comparative Anatomy in the Jardin des 
Plantes. 
PLATE L. 
Front view of the skeletons of the adult Chimpanzee and Orang Utan. The trunk of 
the latter is figured from the specimen belonging to the Zoological Society, and shows 
the normal number of lumbar vertebre, which is the same as in the Chimpanzee. The 
proportions are given according to the size indicated by a cranium and ulna and radius 
in the Museum of the Royal College of Surgeons ; from which it would appear that the 
height of the animal, fairly measured from the vertea to the sole of the foot, could not 
exceed five feet. 
PLATE LI. 
Side view of the cranium of the adult Chimpanzee, natural size. On the left hand are 
figured the germs of the permanent teeth, taken from the skull of a young Chimpanzee 
at the period when the first true molar, f, has appeared. 
a. The first incisor. 
b. The second incisor. 
c. The apex of the crown of the laniary or cuspidatus. 
