PEOFESSOE OWEN ON MACEOPUS. 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 " 

 (PI. LXXIX. fig. 1, c) to the distal end of the ischio-pubic symphysis (ib. K), in 

 Macropus nifiis, is 1 foot ; from the crista {c) to the fore part of the acetabulum {t!) 

 is 5 inches 4 lines : this gives the length of the ectiliac surface (ib. 62)\ which has an 

 oblique haemal and outer aspect, and is concave both lengthwise and transversely ; but 

 it does not exceed an inch in breadth. 



The neural surface (PI. LXXX. fig. 1, 62')^, also concave, both lengthwise and across, 

 especially in the latter direction, has its breadth increased by the hinder extension, u, of 

 the sacro-iliac syndesmosis to 1 inch 5 lines. 



The inner (" median " or " sacral ") surface (PI. LXXX. fig. 3, 62 x) is slightly convex 

 lengthwise, almost flat across; and at 3 inches from the tuberous "crista" (c) begins 

 the reniform surface {p i, p 2) adapted to the sacrum. 



The "crista ilii" (c) is reduced to a sub triangular, roughish, convex tuberosity 

 (PI. LXXIX. fig. 2), 1 inch 3 lines in length, by 9 lines in greatest bi'eadth. The base 

 forms the homologue of the " antero-superior spine " of the ilium (a) ; the apex {b) 

 answers to the " postero-superior spine " of anthropotomy. 



The ridge between the free facets (62 and 62') terminates in a rough raised oval surface 

 (PI. 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. e), to which the pubis contributes (PI. LXXLX. 

 fig. 3, s). The hinder and neural production (PI. LXXX. fig. 2, u) of the ilio-sacral 

 articulation answers to the " postero-inferior spine," and marks the fore part of the 

 feeble concavity (wi) 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 (Pis. LXXIX. & LXXX. fig. 1, 63') is broadest; the outer and upper side (PI. LXXX. 

 fig. 1, 63») has less breadth ; the outer and under side (ib. es) 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 (ef), 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, h') is of great extent, 

 and runs almost straight and at right angles with the body of the ischium from the hind 



' Answering to the " internal iliac fossa " of anthropotomy. 

 ' Answering to the " dorsum ilii " of anthropotomy. 



3n2 



