TO+ SHUFELUVT—OSTEOLOGY OF THE STRIGES. [Dec. 7, 
face has a deep mesial cleft in the vertical direction, limited exter- 
nally by an elliptical curve, internally by a double tuberous knob 
for articulation with the irregularly formed ulnare of the carpus, 
while above is a roughened surface that is covered by the expanded 
end of the radius. The os prominens is not large in Sfeotyfo. 
The carpus in the adult is composed of the ulnare and radiale. 
The radiale articulates with radius, os magnum and ulna. ‘The 
radial articulation is a rather deep and elliptical concave facet, its 
lower border gliding over the ulna, while the distal end of the 
radius plays in the concavity. ‘The opposite face of this six-sided 
little bone is also smooth, and is a nearly flattened surface that 
articulates with os magnum. ‘The upper and lower surfaces, as 
well.as the ends, are simply roughened and fashioned to give the 
proper form to that part of the joint into which it enters, and for the 
attachment of ligaments. Os magnum has become confluent with 
the mid-metacarpal, forming its trochlear surface for articulation 
with radiale, ulnare and ulna. The ulnare is an extremely irregu- 
larly shaped bone; it appears to be rather the larger of the two 
free carpals, and is the lower in regard to position. It articulates 
with ulna and os magnum simply. Its outer ulnar facet is elliptical 
and shallow, monopolizing the entire face of the bone; its inner 
facet is very irregular, being formed so as to accommodate itself to 
the ulnar tubercles, with which it articulates. Projecting toward 
the metacarpus, this little bone has two prongs or limbs, the inner 
aspect of the extremities of each possessing a subcircular facet that 
articulates, the outer and shorter limb with the internal trochlear 
margin of os magnum, on the same side; the inner and longer 
limb straddles the metacarpal and glides over the surface, during 
movements of the joint, at a point about where magnum becomes 
confluent with mid-metacarpal. The ulnare has also attached to it 
ligaments that enclose the wrist-joint beneath—capsular ligaments of 
the carpus. 
The metacarpus is formed in the usual manner, by the amalga- 
mation of the pollex, medius, index and metacarpals, the first, 
second and third respectively. It is 3.3 centimetres long, articu- 
lating with radiale, ulna and ulnare at its proximal extremity by 
means of os magnum, that has become anchylosed with mid- 
metacarpal and the phalanges at its distal end. ‘The first or pollex 
metacarpal is short, and fused with the second just anterior to the 
boundary of the trochlear surface of os magnum; it makes an 
