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(PI. LXXII. fig. 1, 62' j 1 , 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 ] inch 5 lines. The inner (" median " or " sacral ") surface (PI. LXXII. 

 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 l, p 2) adapted to the sacrum. The 

 " crista ilii " (c) is reduced to a subtriangular, roughish, convex tuberosity (PI. LXXI. 

 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 (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. LXXII. fig. 2, d) called " pre- 

 cotylar tuberosity," representing the " antero-inferior spine " of anthropotomy. At the 

 beginning of the ilio-pubic ridge is a strong rough sub quadrate " ilio-pubic " process 

 (ib. e}, to which the pubis contributes (PI. LXXI. fig. 3, s). The hinder and neural 

 production (PI. LXXII. fig. 2, u) 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 (Pis. LXXI. & LXXII. fig. 1, 63') is broadest; the outer and upper side (PI. LXXII. 

 fig. 1, G3*) 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 (04), 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 (/) 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 

 prominence (h) to that which, bending forward, at h', terminates the long ischio-pubic 

 symphysis (k 64** 63**). The hinder end of this symphysis is formed by a triangular 

 epiphysis, which coalesces ultimately with both ischia. Each ischium rapidly expands 

 as it advances forward, or " hcemad," to form the hinder half of the ischio-pubic sym- 

 physis and of the foramen ovale (0). 



The pubis (64) contributes one half to the ilio-pubic process (e) by a projection 

 answering to the pectineal process of the pubis in Monotremes and many Reptiles; 

 and the lower and outer part of that expanded end of the bone forms the pubo-cotylar 

 tuberosity ( 64* ) and a small contiguous part of the acetabulum. Contracting to a 

 narrow plate of bone, the pubis inclines downward and forward, slightly expanding, to 

 join its fellow at the fore half (64**) of the ischio-pubic symphysis, where it extends 

 backward and contributes to the same proportion, and to the anterior part of the 

 circumference, of the " foramen ovale " (0). 



The acetabulum (PI. LXXI. t, t'; PI. LXXII. fig. 2,#) has a subtriangular brim, the 

 angles rounded off and swollen to form the ilio-cotylar (t'), the pubo-cotylar ( 64* ), and 

 1 Answering to the " dorsum ilii " of anthropotomy. 



39 



