220 Annals of the Carnegie Museum. 



nowhere in the series, they gradually disappear after passing the ninth 

 vertebra. The "cup" of the atlas is notched superiorly, and the 

 postero-external angles of its neural arch are produced backwards. In 

 the third cervical we find a short interzygapophysial bar, inclosing, 

 upon either side, a small subcircular foramen, which is replaced by a 

 shallow notch in the fourth vertebra. Both pre- and postzygapophyses 

 in the second to the fifth vertebrae inclusive are exceedingly short and 

 massive, so when these bones are articulated /// sit/i, we are unable to 

 gain a view of the interior of the spinal canal between any two of 

 them, as we do in the case, for instance, between the seventh and 

 eighth, on the superior aspect. The articulations among the centra 

 are of the usual ornithic type, and the neural canal is comparatively 

 large through the cervical chain. Elongation of the vertebrce takes 

 place gradually from the third to the eighth inclusive, but the ninth 

 segment suddenly assumes the general form of a dorsal vertebra. 

 These latter are closely locked together at their articulations ; are 

 entirely devoid of h^mal processes ; while their low quadrilateral 

 neural ones are not in contact with each other in front or behind. 

 They have metapophysial spines which project both anteriorly as well 

 as posteriorly, but fail to meet at either point. The neural canal di- 

 minishes slowly in calibre as we near the pelvic end of the chain, but 

 is of pretty good size throughout. 



In some particulars the pelvis of Tantalus resembles that bone in 

 the true Ibises. On the whole the bone is broad, rather shortish, and 

 sub-compressed in the vertical direction. The postacetabular portion 

 is but very slightly bent on the preacetabular part. Intimate anchy- 

 losis exists between the pelvic sacrum and the ilia ui)on either side. 

 Viewed from above we are to note that the ilia are much expanded in 

 front where they project considerably beyond the sacrum. Their 

 borders are rounded here, with a pronounced emargination, while the 

 mesial borders meet and fuse for a limited distance over the sacral 

 crista. The fore part of this preacetabular portion of the bone for 

 the most part faces upwards, and only outwards as it rises up on the 

 sacrum, and forwards and outwards as it sweeps, on either side, in the 

 direction of the acetabulee. The " ilio-neural canals" are sealed in 

 behind, but open, as usual, anteriorly. Passing to the postacetabu- 

 lar region, we find its lateral borders quite conspicuously sharpened, 

 and where they overhang the antitrochanters — projecting. A row 

 of interdiapophysial foramina occur in the sacrum, the holes becom- 



