ME. ST. GEOEGE MIYAET ON THE SKELETON OE THE PEIMATES. 
303 
The angle formed by the spine of the scapula with the axillary margin of that bone is 
most obtuse in Man, namely about 55° or 60°. It approaches the human proportion most 
closely in the Orang,' aged Semnopithecinse, Mycetes, Pithecia, Nycticebus tardigradus, 
and in Perodicticus, in which it is 40° or upwards ; in the rest it varies between this 
and 20° (it being sometimes as small as 20° in the Chimpanzee, Ateles, Lemur, and 
Cheiromys), except in Galago, where it may be as small as 17°, and in Hylobates, 
where it is at its minimum, namely 15°, or even sometimes only 12°. 
The glenoid surface is broadest in proportion to its antero-posterior (vertical) extent 
in Man and Ateles, namely, about 73 or 75 to 100. In Troglodytes it is about 68 to 
100; in the rest of the Anthropoidea it is less; but the breadth always exceeds half the 
length ; this is not the case in some Lemuroidea, e. g. Indris, Nycticebus, and Chei- 
romys ; and in the Nycticebinse the anterior part becomes remarkably twisted inwards 
towards the midline of the body, and the long axis of the glenoid surface forms an 
angle with the prevailing plane of the blade of the scapula. The angle formed by this 
(glenoid) surface with the axillary margin varies generally between 130° and 144°. 
In the Simiinse, the Pitheciinae, Tarsius, Mycetes, Ateles, and Plylobates it is 125° or 
less, sometimes in the last-mentioned genus being as small as 93°. 
The size of the supraspinous fossa, as compared to the infraspinous one, attains its 
maximum in the Gorilla and Mycetes (Plate XI. fig. 4), then in Hylobates and Arcto- 
cebus. The Orang, Man, the Pitheciinae, Nycticebus tardigradus, Tarsius, and Chei- 
romys have the supraspinous fossa exceptionally small (Plate XI. figs. 5 & 6). 
The anterior (in Man superior) margin is often much produced, so as to be strongly 
convex forwards * * * § , and to much increase the size of the supraspinous fossa. This pro- 
duction does not exist in Man f or in the Simiinae, in which this margin is more or less 
concave, as also in Ateles (external to the suprascapular foramen), Pithecia, and Nycti- 
cebus. In the other forms the anterior margin is generally more or less decidedly 
convex, and attains its maximum of convexity in aged Cynocephali (Plate XI. fig. 2). 
A suprascapular notch is not well defined in the great majority of the order, only, 
indeed, in Man, the Chimpanzee, and the Cebidee, except Pithecia and Chrysothrix ; 
but in some of the last-named family (e. g. Ateles + and Mycetes) it is constantly, and in 
others ( e . g. Lagothrix) it is often so enclosed by bone as to become a foramen. In 
Mycetes a peculiar flat process § springs from the anterior surface of the bridge of bone 
* That this prominence really answers to the anterior margin of Man, and is not produced hy a bending 
downwards and forwards of the anterior vertebral angle, is shown hy the specimens numbered 4756 and 4822a 
in the Museum of the College of Surgeons, in which the true anterior vertebral angle is distinguishable. 
Another reason for this determination is that, in Cynocephalus, Cercopitheeus, and Lemur, the levator anguli 
scajpulce is not inserted into the convex prominence, hut only extends forwards a little in front of the vertebral 
end of the spine, while the omohyoid is inserted into the projecting part of the convex prominence. 
f Except the two South- African skeletons in the Museum of the Loyal College of Surgeons, in which the 
anterior margin is as strongly convex as in Macacus (see Plate XI. fig. 1). 
J De Blainville, ‘ Osteographie,’ Cebus, p. 12. 
§ Mentioned by De Biainyilie, ‘ Osteographie,’ Primates, Cebus, p. 16. 
