ME. ST. GEOEGfE MIYAET ON THE SKELETON OP THE PEIMATES. 
339 
of the femur in the Gorilla, and generally does so to a slight extent in the lower 
Simiidae, though sometimes it is not quite so high as that summit. It rises considerably 
above it in Indris and Lemur. It does not reach it by a considerable interval in Man, 
the Orang, sometimes in Hylobates, and in Ateles. 
It generally projects outwards beyond the general external margin of the shaft of the 
femur, but it does not do so in the Gorilla, Ateles, and Lagothrix, nor in Arctocebus, 
nor, sometimes, in Hylobates and Loris. 
The external margin of the peroneal trochanter more or less blends with a marked 
gluteal ridge in Man and the lower Simiidae and most Cebidae. In Hapale this ridge is 
very prominent, as also in Lemur, Galago, and Tarsius, in the three last developing a 
third trochanter. 
In all the Lemuroidea, except sometimes in the Nycticebinae, there is at least a trace 
of a third trochanter, and such a process is even rarely present in Hylobates *. 
In Troglodytes and Simia there is often a marked concavity at this part. 
The trochanteric fossa, which is rather shallow in Man, is particularly so in the 
Gorilla and Perodicticus. In the other forms it is deep, and in the Anthropoidea, is 
generally deeper relatively in the other genera of the suborder than in Homo. 
In the Lemuroidea it is small, especially in Galago, Arctocebus, Perodicticus, and 
Tarsius. 
The lesser (tibial) trochanter is at its minimum of relative size in Man and the 
Simiinae, except that sometimes in Hylobates it becomes very prominent f . In Hapale 
it is larger, relatively, than in any other of the Anthropoidea. In the Lemuroidea it is 
always very large, even sometimes exceeding in extent the peroneal trochanter. This is 
the case in the Nycticebinse J, especially in Perodicticus and Arctocebus, where it is a 
large plate-like process, and attains the maximum of relative size in the whole order. 
In the Anthropoidea this process is always at a greater distance from the head of the 
bone than in the Lemuroidea, and it is most approximated to it of all in Loris. 
I have found only the anterior intertrochanteric line strongly marked in Man and the 
lowest Simiidae, but it is faintly indicated sometimes in Chrysothrix, Indris, Lemur, Ga- 
lago, Loris, and Tarsius. 
The posterior intertrochanteric line is most prominent in the lower Simiidae, then in 
Man and the Orang, and then in the other Simiinae. 
In Hapale the posterior surface of the femur between the trochanters is wide and flat 
(PI. XIII. fig. 5), presenting an appearance existing in no other genus of the Anthro- 
poidea, but very like that of all the Lemuroidea, where this large flat or concave surface 
serves for the extensive insertion of the quadratics femoris muscle. 
The head of the femur is of a remarkably large relative size in the Orang, and it is 
also large in Indris. Sometimes, instead of being rounded, it is peculiarly compressed 
* E. (j. No. 5026 in the Museum of the Eoyal College of Surgeons. 
f E. g. Nos. 5027 ancl 5027 a in the same museum. 
X De Blainville remarks its great size (l. c. p. 16). 
MDCCCLXVII. 
3 A 
