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PROFESSOR OWEN ON MACROPUS. 435 
by its proximal surface with the scapho-lunar and cuneiform, and by its distal surface 
with the magnum and the fourth and fifth metacarpals. But in the Kangaroo it also 
offers a surface to the ulnar angle of the base of the third metacarpal. 
§ 5. Pelvis. 
The pelvis in Kangaroos is remarkable for its size, especially its length, and for the 
strength of the long prismatic columnar ilia. The length from the “crista ilii” 
(Pl. LXXIX. fig. 1, c) to the distal end of the ischio-pubic symphysis (ib. h’), in 
Macropus rufus, is 1 foot; from the crista (¢) to the fore part of the acetabulum (?’) 
is 5 inches 4 lines: this gives the length of the ectiliac surface (ib. 62)', which has an 
oblique hzmal and outer aspect, and is concave both lengthwise and transversely ; but 
it does not exceed an inch in breadth. 
The neural surface (Pl. LX XX. fig. 1, 62')’, also concave, both lengthwise and across, 
especially in the latter direction, has its breadth increased by the hinder extension, w, of 
the sacro-iliac syndesmosis to | inch 5 lines. 
The inner (“ median” or “ sacral”) surface (P]. LX XX. fig. 3, 62 x) is slightly convex 
lengthwise, almost flat across; and at 3 inches from the tuberous ‘“‘crista” (¢) begins 
the reniform surface (p 1, p 2) adapted to the sacrum. 
The “crista ilii” (¢) is reduced to a subtriangular, roughish, convex tuberosity 
(Pl. LX XIX. fig. 2), 1 inch 3 lines in length, by 9 lines in greatest breadth. The base 
forms the homologue of the “antero-superior spine” of the ilium (a); the apex (6) 
answers to the “ postero-superior spine” of anthropotomy. 
The ridge between the free facets (62 and 62’) terminates in a rough raised oval surface 
(Pl. LXXX. fig. 2, d) called “ precotylar tuberosity,” representing the “ antero-inferior 
spine” of anthropotomy. At the beginning of the ilio-pubic ridge is a strong rough 
subquadrate “ilio-pubic” process (ib. ¢), to which the pubis contributes (Pl. LX XIX. 
fig. 8,s). The hinder and neural production (Pl. LX XX. fig. 2, wu) of the ilio-sacral 
articulation answers to the “ postero-inferior spine,” and marks the fore part of the 
feeble concavity (m) representing, or indicative of, the ‘‘ great sacro-ischiadic notch.” 
The ischium, like the ilium, is a long, straight, triedral column; its inner or median 
side (Pls. LXXIX. & LX XX. fig. 1, 63’) is broadest; the outer and upper side (Pl. LX XX. 
fig. 1, 63*) has less breadth; the outer and under side (ib. 63) is the narrowest : this is 
continued upward, and sinks, near the acetabulum, to form the deep cotylar notch (y). 
Here the bone seems to bifurcate, the anterior pillar swelling to join the pubis at the 
pubic cotylar tuberosity (64’), the hinder one expanding to form the ischio-cotylar tube- 
rosity (63*). A low and long slightly roughened convexity of the hind or neural border 
of the ischium (J) represents its “spine.” The thick tuberosity (/, h')is of great extent, 
and runs almost straight and at right angles with the body of the ischium from the hind 
1 Answering to the “internal iliac fossa” of anthropotomy, 
2 Answering to the “dorsum ilii” of anthropotomy. 
3N2 
