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Show 1873.] DR. J. HECTOR ON CNEMIORNIS CALCITRANS. 767 its upper margin being united with the ilium for the last two inches, forming a rhomboidal convex plate with a squamous posterior margin that descends obliquely backwards. The inferior margin is produced, and has been united by cartilage to the pubic styles for about 6 lines. The latter are attached by a stout compressed process to the inferior fifth of the acetabulum, and thence produced backwards as a narrow curved bone, flat externally, and with a strong ridge internally, 3 lines wide at its narrowest part, and posteriorly expanding into a flat curved process that descends at an obtuse angle, and continues the squamous edge of the posterior pelvic aperture. The coccygeal bone is wanting ; the first sacral vertebra is anchylosed to the sacrum only by its spinous process. The posterior roof of the pelvis is pierced by eight foramina in almost parallel lines an inch apart, separated by a concave interspace anteriorly, and a convex ridge posteriorly, the rhomboidal form of the area being produced by a blunt expansion of the border, which on either side overhangs the antetrochanteric process. Sternum. (Plate LXVIII.) This bone is almost perfect, having lost only a few lines of its inferior margin ; and though it differs considerably from the characters attributed to it by Professor Owen, this is without doubt due to his not having had a connected fragment of the superior portion of the bone, so that its enormous posterior concavity was not appreciated. It is chiefly remarkable for its irregular oblong shape, without any irregularities of outline or unossified interspaces. Its texture is dense, and, with its great size, gives it a weight equal to that of the femur. Its general form is scaphoid, the concavity being very marked in the upper half, amounting to 1 inch in depth measured from a transverse chord, and to 1\ inch in depth if measured from a longitudinal chord, the length of the latter being 7 inches. The anterior width at the costal processes (a) is 4 inches, and at the posterior end of the costal border 3 inches 6 lines. The costal border (e-e) occupies half the lateral margin of the bone, the posterior half of the bone being only slightly concave interiorly, and exteriorly being flat in the middle, and sloping very slightly to the inferior angles. The superior margin is thin, and presents a wide mesial notch (/) and two lateral notches (g), which are bounded exteriorly by the costal processes, which project backwards and upwards for 6 lines. The coracoid grooves (b and b') are 1 inch 6 lines in length, and 2 lines in depth of anterior border; they are separated by a slight triangular interspace 5 lines wide, beneath which is a shallow ' triangular pit. The keel (c) commences by two angular ridges bounding this pit posteriorly, and forms a blunt process 3 inches in length, expanded anteriorly to a rough tubercular surface 4 lines in width and 9 in length, and then compressed into a narrow tubercular ridge that is gradually lost in the smooth convex surface of the bone at less than one half the distance from its superior margin. The greatest elevation of the keel above the convex surface of |
