the forward folding of the post-scapular border. The surface between the coracoid
border and its posterior ridge forms a long, oval, concave area, with the surface
behind it defined posteriorly by the meso-scapular groove shelving down from
before backwards. The surface between the groove and the ridge of the glenoid
border is flat.
The clavicle is convex from behind forwards and concave from above downwards.
A short ridge marks the anterior surface close to the pre-stemal head of the bone with
a corresponding concavity above it. The acromial head of the bone is bent slightly
backwards, and is flattened and dilated at its extremity.
The humerus is elongated and cylindrical. The articular surface is irregularly
rounded. The internal tuberosity is small and much separated from its fellow by a
shallow bicipital groove. The external tuberosity is moderately large, and is more or
less continuous below with the deltoid ridge, which arches upwards, backwards, and
outwards, to terminate immediately below the head of the bone on its external
aspect. The deltoid ridge begins a little above the middle of the bone as a sharp,
laterally compressed ridge, projecting slightly forwards, but not much beyond the
surface of the shaft below it. The ecto-condylar ridge is not prominent, and it
terminates below the level of the deltoid attachment, but no groove for the musculo-
spiral nerve can be detected. The internal condyle is little more than half the
breadth of the trochlear surface, but the margin of the bone above it is perforated
by a supra-condylar foramen of considerable size. The acromial fossa is not so
deep as its fellow in front, and the two'are separated from each other by a plate of
bone as thin as the finest tissue paper.
The radius has an outward and forward curve which begins below the process
for the attachment of the biceps flexor muscle, and is continued as far as the
middle of the bone, while the direction is inwards, so that the two extremities of the
bone are in the same line.
The n In a, is more or less laterally compressed, and its anterior margin forms a
sharp ridge which expands from behind forwards a little above its middle, so that it
comes into close contact with the ulna to such an extent that the two bones at first
sight, in some specimens of T. bela/ngeri and T. ellioti, appear to be almost united
in that region. There is an open space between the two bones above and below
that part, but below that again they are in close contact. On both aspects
the ulna, is concave external to the anterior ridge, but the concavities stop
short a little way above the inferior extremity. The internal concavity runs from
the coronoid process anteriorly, and the external from the upper margin of
the sigmoid cavity. The olecranon is produced considerably behind the sigmoid
cavity, and is marked externally by a groove and superiorly by a depression
for the triceps extensor muscle. Its posterior margin is narrow and
rounded.
The carpus has a scapho-lunar bone and an os intermedium with a well-developed
pisiform, which, along with the process of the first-mentioned, makes the under
surface of the carpus markedly concave. The phalanges are of moderate length and
cylindrical.
The pelvis is remarkably distinct from the pelvis of Hylomys, Crocidu/rat or
Talpa, and approaches more to the pelvis of Erinaceus.
The ilium is rather narrowly expanded, concave externally, with a nearly
straight supra-iliac border. The sacral surface of the bone is rather «mn.il, and the
bone rises above the sacrum, bending upwards, forwards, and outwards, the inner
surface being nearly flat. The iliac border is rather broad, especially near the acetabulum,
owing to the development of a pre-acetabular process. The pubic border is
very sharp. The thyroid foramen is very large and a short oval, and the
posterior margin of the ischium rounds off forwards and inwards from the
tuberosity, which does not project as a distinct process. In two skeletons before
me, and both of which have adult dentition, but with the epiphyses of the inferior
articular extremity of the femur distinct, the symphyses of the sacrum are not
united.
The femur is a long bone with the 3rd trochanter forming a rather elon-
gately triangular, prominent, thin plate of bone more or less concave on its two
sides. The internal trochanter forms a well-marked process, and the digital fossa
is small, triangular, but deep.
The tibia and fibula are quite distinct, and only come in contact with each
other at their extremities.
The calcaneum is narrow and laterally compressed in its posterior half, and
broad anteriorly. The under surface is nearly flat in the middle line, but slopes off
at the sides. The sustentaculum tali forms a very prominent process projecting
inwards nearly at right angles to the bone. The tubercle for the attachment
of the calcaneo-cuboid ligaments forms a distinct minute process external, anterior
and immediately below the sustentaculum tali.
The astragalus presents no features worthy of special remark. The cuboid
bone has the form of a very much shortened metatarsal, broadest in its posterior
and suddenly narrowing to its anterior half, which is shortly cylindrical and
is deeply grooved beneath for the tendon of the peroneus longus. The short and
broad scaphoid presents a rather rounded eminence above, and the tubercle for
the tibialis posticus muscle is well developed. The internal cuneiform is broadest
from above downwards, narrow and rather pointed behind for articulation with
the scaphoid, being laterally compressed from without inwards. The second
cuneiform is laterally compressed, and presents a dorsal concave surface which
looks inwards and upwards. The third is shortly cylindrical and rather deeply
grooved below. The metatarsal bones are long and slender, the second and fourth
being nearly of equal length, and the third very slightly longer than the other
two; the first and fifth are nearly equal, the latter, however, being the larger.
The proximal process of the fifth fdrms a hook, which projects backwards and
outwards.