. Contributions to the anatomy of birds . r the ailio-neural Canals, the Close approximation Of the Sacrum of Catharista atrata,- viewed from ilia in others of the group precluding it. above; llfe size- The thoroughly united neural spines on this their superior aspect inthis bird are also broad and flat from one extremity to the other, whilein Catharista and Gyparchus such portions of them that show behind areslightly rounded from side to side, a condition well marked in the the reader again to Plate XXI, figure 117, we observe howcomplete is the series, on either side, of in
. Contributions to the anatomy of birds . r the ailio-neural Canals, the Close approximation Of the Sacrum of Catharista atrata,- viewed from ilia in others of the group precluding it. above; llfe size- The thoroughly united neural spines on this their superior aspect inthis bird are also broad and flat from one extremity to the other, whilein Catharista and Gyparchus such portions of them that show behind areslightly rounded from side to side, a condition well marked in the the reader again to Plate XXI, figure 117, we observe howcomplete is the series, on either side, of interapophysial foramina inthe Turkey Buzzard, and how an additional row of smaller ones existoutside of these; then by examining our cut of the sacrum in Catharistaatrata (and the condition obtains next best in Gyparchus), we observe howit occurs among others; they are confined almost to the few ultimatevertebrae in Pseudogryphus and Sarcorhamphus. The anterior marginsof the ilia are finished off above by a smooth and raised border, which. 778 GEOLOGICAL SURVEY OF TIIE TERRITORIES. seems to be produced over the extremities of the diapophyses of thefirst sacral vertebra? in Cathartes and the Condors. This border is car-ried backwards a certain distance to be lost in the true gluteal ridge,of which it is the anterior extension. It is less prominent in Gyparchus,as seen in a good life-size figure of the sternum of this Vulture givenby Eyton in his Osteologia Avium. Posteriorly, and where the sacralvertebrae are visible from above, the outline of the area they appropriate,is lozenge-shaped, the anterior angle being in the locality of the pointwhere the ilio-ueural canals terminate posteriorly in most birds; theposterior angle is in the last sacral vertebra, while the lateral angles areabout opposite the ace tabula, corresponding to the longest processesthrown out from the vertebra below as abutments at this importantpoint. The last sacral vertebra, in all of the Cathartidce, althoug
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbirds, bookyear1882
