304 
MR. ST. GEORGE MIYAET OR THE SKELETON OE THE PRIMATES. 
bounding this foramen anteriorly, a process existing in no other genus (Plate XL 
fig. 4a;). 
The supraspinous fossa is almost always deepest, from before backwards, at its verte- 
bral end. Not so, however, in the Orang *, and scarcely so in Pithecia. 
The axillary margin, apart from the production for the teres major , is generally 
straight, especially in Troglodytes, Hylobates, Ateles, Mycetes, Loris, and Nycticebus 
javanicus. It is markedly concave in Perodicticus and Nycticebus tardigradus (Plate XII. 
fig. 1, and Plate XI. fig. 6) ; on the other hand, it is convex in Simia and Indris. This 
margin is generally more or less grooved longitudinally, but only in Indris is this 
groove so placed as to be visible on the dorsum of the scapula. 
The surface for the teres major projects out very strongly in the lower Simiidse, Cebus, 
and Chrysothrix. On the other hand, in the Simiinse, Ateles, Indris, and the Nyctice- 
binse it is less marked than in Man, and, indeed, in Indris, Loris, and Nycticebus it 
does not project at all (Plate XI. fig. 6). 
The vertebral margin is generally more or less convex, but sometimes in Man, the 
Gorilla and Orang, Ateles and Chrysothrix, it presents a sigmoid curve. Sometimes it 
is nearly straight, as in Indris ; sometimes it is very strongly convex, as in Perodicticus 
(Plate XII. fig. 1). 
The convexity of the middle part of the infraspinous fossa, which is present in Man 
and, more or less, in the Simiinse, does not generally exist. In Mycetes a projection* 
like a faintly-marked second spine, traverses the outer surface of this fossa midway 
between the spine and the axillary margin. 
The subscapular fossa is particularly deep in Hylobates ; in Mycetes it is traversed by 
jstrongly-marked ridges, in Indris its posterior part is strongly convex. 
The spine generally extends from quite the vertebral margin to a point more or less 
near the border of the glenoid surface. In the Gorilla, however, it rarely attains the 
vertebral margin^, and it scarcely does so in Hylobates, where the depth of the spine 
subsides with great rapidity, as also in Ateles and Nycticebus javanicus. 
The superior (in Man posterior) end of the spine is almost always much nearer 
to the anterior than to the posterior end of the vertebral margin ; but in the Chim- 
panzee it is (generally at least) nearer to the latter, and in Hylobates, alone of all 
primates, it is considerably nearer to the latter than to the former. In the Gorilla, 
Ateles, and Arctocebus it is more remote, relatively, from the anterior end of the ver- 
tebral margin than in Man ; in all the others, including Simia, it is relatively nearer 
to it. A smooth, flat, triangular surface at the vertebral end of the spine, and ex- 
tending thence downwards (forwards in Man) along its margin for a greater or less 
extent, exists in Man, the Orang, Mycetes, Loris, and Arctocebus. 
The spine, except at its acromial end, always stands out more or less at right angles 
with the outer surface of the blade of the scapula, but sometimes it inclines forwards over 
* Owex notices this condition of the supraspinous fossa in the OsteologicalCatalogue of Coll, of Surg., toI. ii. 
t Noticed by Dtjvernoy in Arehiv. du Mus. tome viii. p. 40. 
