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 inter- 

 space 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 in- 

 ferior 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 trans- 

 verse chord, and to 1| inch in depth if measured from a longitu- 

 dinal 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 mar- 

 gin. The greatest elevation of the keel above the convex surface of 



