34ft 
MB. ST. GEOEGE MIVAET ON THE SKELETON OF THE PEIMATES. 
transversely. This is the case in the Nycticebinse, especially in Nycticebus, and some- 
what so in Tarsius. 
The head is much inclined forwards in the Siamang, and in Indris also, though to 
a less extent ; sometimes it is much so in Cynocephalus and in Man. 
The pit for the insertion of the ligomentum teres is always present except in the 
Orang (in which it is almost constantly absent)*, and sometimes in the Gorilla f . It 
is larger and deeper relatively in the lower Simiidse than in Man, and it is very large 
in Ateles. On the other hand, it is small in Indris and Lemur ; and there is but 
a faint indication of it in Perodieticus, though it is large in Arctocebus and enormous in 
Nycticebus. 
The condyles are prolonged backwards about equally in Man, and are nearly eqnal in 
size, and in most forms the outer one is but little smaller or less prolonged backwards 
than the inner one. In the Simiinse, however (especially the Gorilla and Hylobates), as 
also in Ateles, Lagothrix, Indris, Arctocebus, Perodieticus, Cheiromys, and sometimes in 
Lemur, the internal condyle projects considerably further backwards than does the ex- 
ternal one. 
Supracondyloid prominences are more or less strongly and sharply marked in Man 
and the Simiinse $. They are less so (except perhaps in some of the higher and larger 
Cebidse) in the other Anthropoidea, and in the Lemuroidea; it is only in the Nyctice- 
binse that they become rather prominent and pointed. 
In Tarsius the femur is exceptionally narrow at this part. 
The intercondyloid space behind is especially wide in the Simiinse and Pitheciinse, and 
rather much so in Loris and Perodieticus. It is sometimes very shallow, as in Ateles., 
The rotular surface is generally moderately concave from side to side, and is especially 
shallow in the Simiinse and Nycticebinse. It becomes deeper in Man and in most An- 
thropoidea, but in the Lemuroidea this deepening is carried much further, especially in 
Tarsius. The parts of this surface supported by the two condyles respectively are almost 
always pretty nearly of the same size ; in Man alone the part supported by the external 
condyle has a great predominance over the other. In the Lemuroidea, other than the 
Nycticebinse, however, the external margin of the rotular depression projects much 
more than does the internal one, especially in Indris. 
The depression serving for the origin of the planiaris muscle is, as far as I have been 
able to observe, deepest in the Chimpanzee and sometimes in Hylobates. In the other 
Anthropoidea it is only slightly marked^ and in the Nycticebinse is altogether absent §. 
* I find in the skeleton of an Orang, No. 3 i in the Osteological Collection of the British Museum, that each 
femur exhibits a small hilt distinct impression on its head, in the place occupied in other genera by the pit for 
the round ligament. See Trans. Zool. Soc.. vol. vi. pi. xl ; fig. 7 i. 
t A. g. in the femora of the skeletons Nos. 5179 a and 5179 n in the Museum of the Eoyal College of 
Surgeons. 
± In Man the inner one is the larger, in Troglodytes the outer one. See Owen, Trans Zool. Soc. pp. 14—18, 
and pL 7. figs. 1, 4, 6. 
§ Themuscle itself being absent (Proc. Zool. Soc. 1865, p. 251). 
