. The structure and classification of birds . FIG. 162.—SYRINX OF Podicaxenccjalensis (AFTER BEDDAKD). FIG. 163.—STERNUM OF VIEW. (AFTER BEDDARD.) The syrinx is typically tracheo-bronchial, and in no wayremarkable. The osteology of the Heliornithidae is not very decisive asto their affinities. In Podica there are seventeen cervicalvertebra, an advance upon the fifteen of the rails and anapproach to the twenty-one of Podiceps. Six ribs reach thesternum in both genera of Heliornithidae. The sternum hasbut one pair of notches, and in Podica, at any rate, the spinaexterna is well

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. The structure and classification of birds . FIG. 162.—SYRINX OF Podicaxenccjalensis (AFTER BEDDAKD). FIG. 163.—STERNUM OF VIEW. (AFTER BEDDARD.) The syrinx is typically tracheo-bronchial, and in no wayremarkable. The osteology of the Heliornithidae is not very decisive asto their affinities. In Podica there are seventeen cervicalvertebra, an advance upon the fifteen of the rails and anapproach to the twenty-one of Podiceps. Six ribs reach thesternum in both genera of Heliornithidae. The sternum hasbut one pair of notches, and in Podica, at any rate, the spinaexterna is well developed. The skull is, on the whole, rail-like, bearing, perhaps, a greater resemblance to Aramidesthan to any other genus of rails. The clavicles, contrary towhat is met with in the rails, reach, and are firmly attachedto, the carina sterni. /.s (fig. 164) of the Heliornithidae is in some respects 3-28 STRUCTURE AND CLASSIFICATION OF BIRDS

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898