ME. ST. GEOEGE MIVAET ON THE SKELETON OF THE PEIMATES. 
351 
The articular surface in Man looks more straight forwards than in the other forms, in 
which latter it is directed more tibiad, a condition which is very marked in Troglodytes. 
The long axis of this articular surface always forms a more or less acute angle with a 
line drawn across the articulations of the four outer metatarsal bones where they join 
the proximal row of tarsals (Plate XIV. fig. 8). 
In the lower Simiidge this angle is quite as acute as in Man (Plate XIV. fig. 9), 
or even more so ; and the same is the case in the Lemuroidea, but in Troglodytes the 
angle is a little more open, though nothing nearly so much so as is the homotypal 
angle in the human hand, nor even equalling that of the manus of the same species. 
The other Simiinse * resemble Man and the lower Simiidse in this respect. 
The articular surface is sometimes (as in Hylobates, the lower Simiidae, and to a 
certain extent in Man) notched on its peroneal side, but there is no concavity of the 
surface, making it a saddle joint, in any of the Anthropoidea, though I have observed 
a very slight depression towards the lower end of the cylinder in the Chimpanzee, 
Cebus, Mycetes, and Hapale. In the Lemuroidea, however, there is a true and decided 
saddle joint (Plate XIY. fig. 13), though the concavity is very slight in Indris, Galago, 
and Perodicticus, and all but obsolete in Nycticebus Javanicus. 
The articular surface for the second metatarsal is almost always closely approximated 
to the surface destined for the hallux ; in Simia, however, the two are widely separated f. 
A strong tubercle or ridge sometimes projects from the middle of the inferior margin 
of the tibial surface, as in Ateles, Perodicticus, and Lemur. 
Meso-cuneiforme . — This bone is sometimes very much vertically extended, as compared 
with its other dimensions, as in Man, Troglodytes, and the Nycticebinse. Generally, per- 
haps, it is, as in Macacus, about as long as high. In Lemur the antero-posterior 
extent sometimes predominates. 
The postero-inferior angle is sometimes produced into a sort of rounded head, as 
in the lower Simiidae, and to a slight extent in the Nycticebinse. In others, as Man, 
Troglodytes, Ateles, Lemur, this is not the case. 
In some of the Lemuroidea (certainly in Lemur and Loris, and probably in Indris and 
Galago) it joins the cuboides beneath the ecto-cuneiforme. This is never the case in 
the Anthropoidea. 
Ecto-cuneiforme . — The external cuneiform bone is sometimes much longer vertically 
than antero-posteriorly, as in Troglodytes and Simia. It is very slightly so in Hylo- 
bates. The two dimensions are about equal in Macacus, Ateles, Lagothrix, Mycetes, 
and Loris. In Man, the Pithecinse, Nyctipithecus, and Chrysothrix and others, it is 
slightly longer than high, and twice as long as high in Lemur J. 
* Dr. Lvcajj remarks the difference between the Gorilla and Orang in this respect ( Joe . cit. p. 304. Tab. 3. 
fig. 6 a, b). 
f Eepresented in Dr. Lucae’s plate 3. figs. 5 & 6, and noticed by Professor Huxlev (see ‘ Medical Times ’ 
for 1864, vol. i. p. 565). 
t Well represented in Fischer’s ‘ Anatomie der Maki,’ Tab. 15. e. 9. 
