ME. ST. GEOEGE MIVAET ON THE SKELETON OF THE PEIMATES. 
321 
In Man and the Simiidse the proximal angle of its radial side is produced, — not so in 
other forms. 
In all but Man, Troglodytes and the Indrisinse, it articulates with the intermedium. 
Magnum . — This bone is not generally the largest of the carpals *. As seen in a 
carpus with the bones articulated together, it appears much less than the unciforme in 
Hylobates, as also generally in the lower Anthropoidea, and always in the Lemuroidea. 
It has throughout much the same shape as in Man ; but its distal articular surface is 
often more concave, as are also its lateral margins. 
It projects distally beyond the trapezoides in Man, the Simiidse (though very slightly 
so in Hylobates), the Cebidse (except Ateles and Lagothrix), Hapale, Lemur, the Nyc- 
ticebinse, Tarsius, and Cheiromys. 
It may or may not articulate with the fourth metacarpal. Thus in the lower Simiidse 
there is a distinct articular surface for the latter, but not in Lemur. 
Unciforme . — In all the Primates this bone has a shape very similar to that which it 
presents in Man, but, as has been already remarked, it often predominates in size over 
other carpals. 
The palmar process is enormously long in Hylobates, and I have found it f very large 
in the Nycticebinse, large also in Indris, the Simiinse (especially Simia), and Man. In 
him and in the Nycticebinse this process projects much palmad, in other forms less 
palmad and more distad. In some, as in Macacus and Lemur (at least sometimes), 
it is so small as to form merely, as it were, the palmar lip of the distal articular 
concavity. 
As has been said, an extra bone exists in Perodicticus, namely, an ossification of the 
anterior ligament of the carpus between the processes of the trapezium and unciforme. 
This small bone, which has been described and figured by Van CampenJ, is subtrian- 
gular in shape, and joining, as it does, the unciform process on one side, and the 
tuberosity of the trapezium on the other, it causes the flexor tendons to pass through a 
complete bony ring (Plate XIV. fig. 5). 
Metacarpus. 
The greatest absolute length of this segment is exhibited by the third metacarpal of 
Simia. 
The length of this part of the skeleton, as estimated by a comparison of the third 
metacarpal with that of the whole manus, is, greatest in Simia and Troglodytes, where 
the length of the former is almost two-fifths of that of the latter. In the rest of the Order 
it varies between this dimension and that of Brachyurus and Loris, in which genera it is 
very little more than a quarter, except in Arctocebus, where it is even somewhat less. 
* Speaking of Cercopithecus sabteus, De Blaintille remarks that the unciforme is larger than the magnum 
( l.e . p. 16). 
f Yet De Blainville found it little marked ( loc . cit. Lemur, p. 15). 
$ In the periodical before referred to. 
