1870.] DR. J. MURIE ON SAIGA TARTARICA. 471 
The lunare or semilunar bone has a figure-of-eight shape, but 
with numerous prominent angular facets. It is smaller than the sca- 
phoid. The proximal surface articulates chiefly with the median 
fossa of the radius and the crest on the outer border of the inner 
facet. Its lateral constrictions are filled by the corresponding emi- 
nences of the scaphoid and cuneiform. Distally it presents two small 
flattish quadrangular facets, and behind these a couple of grooved 
ones ; these coincide with the approximate parts of the magnum and 
unciform. 
The cuneiform offers two angular faces, which wedge into the 
neighbouring concavity of the lunare. Proximally the cuneiform 
articulates by a raised portion with a small part of the radius; and 
outside this there is a deep oblique groove for the reception of the 
styloid process of the ulna. The distal surface rests solely upon the 
unciform bone ; a posterior outer and downward process rests in the 
fossa on the outside of the unciform. 
The long diameter of the pisiform is vertical. It is a rather large, 
ovoid, convex, and laterally compressed bone, the inner surface being 
deeply grooved for the transmission of tendon. 
The os magnum differs from all the bones of the row in being re- 
latively thin, flattish, wide and diamond-shaped. The upper surface 
is quite level on the outer half for the reception of the scaphoid ; 
and on the inner half it presents fore and aft facets, upon which, 
as aforesaid, those of the lunare rest. Its articular surface with the 
unciform is concave. The metacarpal articular surface is quite a 
horizontal plane, except the trapezoidal portion, which is rather more 
indented. The homologue of the trapezoid bone is only indicated by 
a tuberous condition of the inner posterior angle of the magnum. 
The unciform, like the magnum, has a very smooth under surface, 
which plays on the proximal end of the fourth metatarsal (7. e. the 
outer one present). The upper surface of the bone is uneven, and 
possesses several facets at different angles and planes, which articu- 
late with parts of the lunare and cuneiform. That fossa outside, 
wherein the descending process of the cuneiform lies, is well marked. 
The cannon bone is a long and beautifully finished pillar, a slight 
mesial groove indicating third and fourth metacarpal elements. A 
nutritious foramen penetrates the bone at either end of the said fur- 
row. A delicate spicular rod of bone 23 inches long, and represent- 
ing a second metacarpal, is seen in the College of Surgeons’ skeleton ; 
this must either have been cut away or was absent in the Society’s 
specimen. Behind the digital end of the connate metacarpals are 
two pairs of large-sized sesamoid bones, each pair appositely placed 
with a median groove for the long flexor tendons. Futhermore, in 
the Hunterian specimen three additional free and minute ossicula 
have been preserved ; of these, two are placed on the inner and one 
on the outer side of the metacarpo-phalangial joint. 
The phalanges, proximal, median, and distal, are of fair strength, 
and, all more or less, laterally compressed. The last or ungual digits 
are comparatively short and high. Behind the lower extremities of 
the second phalanges two large sesamoids are met with. 
