. Anthropology . to the latter a short time previous tobirth. In Man, the iliac bones are expanded, laterally, into two greatwings, thin in the centre, and concave—admirably constructed tosupport the mass of the viscera, and in the female the weight ofthe foetus. Their external surface, or external iliac fossa, is, in *consequence, convex, to give insertion to the muscles of the buttockIn quadrupeds, on the-contrary, the iliac bones are closer together,are elongated on each side of the lumbar portion of the column, and f 2 PELYIS. [Chap. ii. convex on their internal surface, the external becom
. Anthropology . to the latter a short time previous tobirth. In Man, the iliac bones are expanded, laterally, into two greatwings, thin in the centre, and concave—admirably constructed tosupport the mass of the viscera, and in the female the weight ofthe foetus. Their external surface, or external iliac fossa, is, in *consequence, convex, to give insertion to the muscles of the buttockIn quadrupeds, on the-contrary, the iliac bones are closer together,are elongated on each side of the lumbar portion of the column, and f 2 PELYIS. [Chap. ii. convex on their internal surface, the external becoming inverselyconcave. The iliac bones in Man therefore have somewhat the form of valves,which are composed of flat bones. They rapidly become long andtapering, on the contrary, in quadrupeds, as in the equidse, the hare,and the kangaroo, and are converted, as it were, into long these two arrangements are seen all kinds of intermediaryones. The measurements which we have made upon two hundred and f. a t Fig. 10.—The pelvis in Man : a, Portion of the base of the sacrum, which is articulatedwith the last lumbar vertebra b, Iliac crest, or superior border of the ilium;c, Cotyloid cavity, in which is received the head of the femur; d, Symphysis pubis,or articulation of the two bones of the pubis ; e, Point where the ischium, which isto the outside, is united to the pubis, which is to the inside. seven different pelves, serve to throw light upon this subject, andmay be thus summed up :% The maximum length, taken from the point of the ischium to the farthest point of the iliac crest, exceeds the maximum , breadth taken from one iliac crest to the other in 23 per cent. of the ruminants examined, thirty-two of the carnivora, thirty- . * Sur les Proportions Generates chez 1Homme et les Mammiferes, byPaul Topinard, in Ball. Soc. dAnthrop., 2nd series, vol. x., 1875. Chap, ii.] THORAX. 69 three of the rodentia, thirty-seven of the marsupialia, and thirty-eight of the eden
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