12 PROFESSOR ALLMAN ON THE CHARACTERS 
edge of the coronoid process runs downwards and slightly forwards, with a convex curve ; 
it meets the horizontal ramus at about a line behind the posterior molar. 
Anterior Extremities—The scapula measures one inch in length, and is half an inch 
broad at its base, which forms a uniform convex curve. From the angles of the base 
the superior and inferior cost converge towards the anterior end of the spine, where 
the scapula becomes contracted into a neck, whose superior margin is continued into a 
slightly prominent coracoid. The supraspinal fossa is posteriorly about twice as broad 
as the infraspinal fossa; but it rapidly narrows towards the neck of the scapula, and then 
disappears, while the infraspinal fossa continues still distinct. The long free edge of 
the spine is continued forwards as a very slender acromion. ‘The glenoid cavity is ovo- 
triangular, with its apex directed downwards, The subscapular surface is smooth and 
slightly concave. 
The clavicles are entirely absent. 
The humerus, measured from the upper surface of its head to the lower end of the 
bone, is 1,3; inch in length. ‘The head is nearly hemispherical ; the lesser tuberosity 
forms a slightly elevated prominence; while the greater tuberosity forms a strong 
pyramidal projection, by which the axis of the shaft is continued for about 7oths of an 
inch beyond the head. ‘The shaft of the humerus presents a sharp edge in front, and 
is smooth and rounded behind. ‘The anconeal fossa is imperforate, and there is no 
foramen above the internal condyle. Almost the whole of the front of the elbow-joint 
is formed by the surface for the radius. 
The ulna, measured from the superior margin of the great sigmoid cavity to the lower 
end of the bone, is 1 inch in length; the olecranon process is ;%;ths of an inch. ‘The 
radius and ulna are quite distinct; but the radius cannot be rotated on the ulna so as 
to effect supination. 
There are eight bones in the carpus, arranged in the usual proximal and distal series, 
with four bones in each series. The pisiform bone is large and subcylindrical; it 
projects backwards from the outer side of the wrist, so as to form a sort of carpal heel. 
The metacarpal bone of the pollex is the shortest; that of the minimus comes next to 
it in length; those of the index and annularis come next, and are equal to one another, 
while that of the medius is the longest. 
Posterior Extremities.—The pelvis is narrow. ‘The ossa innominata articulate with 
the first and second sacral vertebre. The ilium is a narrow bone, nearly semicylindrical 
in shape, convex on its outer surface, and with its superior or anterior end slightly 
everted. The ischium nearly continues the axis of the ilium as far as the thin tuber- 
osity, and then turns vertically downwards to form the posterior boundary of the oval 
obturator foramen. The pubic bones form an angle of about 188° with the iliac, being 
thus almost ona line with them. The two pubic bones converge towards one another, at 
an angle of 40°; but they form no true symphysis, being separated from each other at 
their posterior and inferior angle by a space of about oth of an inch wide, which is 
