310 
ME. ST. GEOEGE MIYAET ON THE SKELETON OE THE PEIMATES. 
almost as low as the margin of the innermost border of the trochlea ; it is also very 
much bent down in Lemur, Tarsius, and Cheiromys. 
A supracondyloid foramen is only present in the Anthropoidea, in Cebus, the Pithe- 
ciinse, Chrysothrix, Callithrix, sometimes in Nyctipithecus, and sometimes in Hapale * ; 
on the other hand, it is present in all the Lemuroidea except Arctocebus. 
The surface of the humerus between the internal condyle and the innermost border of 
the trochlea extends in front of and behind that condyle in all the Anthropoidea. This 
surface is largest relatively and absolutely in Man and the Simiinse, where it extends in 
front of, beneath, and behind the condyle, though in Hylobates it is largely developed 
only in front of it. In the lower Simiidse its posterior part either disappears or only 
exists as a very narrow groove overlapped by the condyle. In the Cebidse this surface 
is smaller, and scarcely ever projects below the end of that process. In Indris and 
Cheiromys it is not developed in front of the condyle, but in the other Lemuroidea 
it is developed both in front of it and behind it, and pretty equally so in the Nycti- 
cebinse. 
The coronoid fossa is generally shallower in the Lemuroidea than in the Anthropoidea. 
A perforation extends into the olecranal fossa in some. This is very large and constant 
in Loris, but it is also present in Troglodytes f and Simia, and sometimes in Hylobates, 
Man, Cercopithecus, Macacus, and Arctocebus. 
The olecranal fossa is sometimes deep, as in the Simiidse, especially the Cynopithecinse. 
It is less so in Man, and still less so in the Lemuroidea, especially in Indris. 
The capitellum is largest relatively in the Lemuroidea, where it often (as in Indris 
and the Nycticebinse) occupies half, or more than half, of the articular surface of the 
distal end of the humerus (Plate XII. fig. 6). It is next largest in the Cebidse, smaller in 
the Simiidse other than the Simiinse, still smaller relatively in Hylobates and Simia, then 
in Man and the Chimpanzee, and relatively smallest of all in the Gorilla. Sometimes 
in Cynocephalus, as also in Mycetes, Lagothrix, Indris, Nycticebus, and Perodicticus, 
the smooth surface is prolonged outwards externally to the convexity of the capitellum. 
The projection of the radial margin of the trochlea is most prominent in Hylobates, 
the Chimpanzee, Man, the Gorilla, Indris, Lemur, and Hapale. It all but or quite 
disappears in the Cynopithecinse (Plate XII. fig. 4), many Cebidse (especially Ateles and 
Lagothrix), Loris, Nycticebus, and Arctocebus. 
The innermost margin of the trochlea projects downwards below its radial margin in 
Man, the Chimpanzee, Simia, and the Cynopithecinse, and very much so in the Cynoce- 
phali (Plate XII. fig. 4). It projects below the radial margin, but very slightly (or not 
at all) below the capitellum in the Semnopithecinse, Cebidse, and some Lemuroidea, e. g. 
Galago and the Nycticebinse. 
* In the Tamarin, according to De Blainville, l. c. p. 22, he adds, “ ce qni n’a pas lieu cependant ni chez 
le Pinche ni chez les Ouistitis.” 
t In the specimens of T. Niger, Nos. 5177 c and 5177 n in the College of Surgeons, this perforation 
exists. 
