. The structure and classification of birds . FIG. 77.—SKULL OF Rhea. VENTRALVIEW. (AFTER HUXLEY). ; premaxilhv ; J/r/>, maxillo-palatiue; R,rostrum ; Vo, vomer; Jl, palatine; Pf,pterygoid ; *, basipterygoid process. Pmx,. FIG. 78.—SKULL OF Dacclo (AFTERHUXLEY). Ln, laoiymal. Other letters as iu previousfigure. their skull would lead us to believe. Neither are any of thesubdivisions, except that of the dromseognathse, really satis-factory from the classificatory point of view. Their in-efficiency, however, is rendered harmless by the fact that OSTEOLOGY 141 they are in reality not suc
. The structure and classification of birds . FIG. 77.—SKULL OF Rhea. VENTRALVIEW. (AFTER HUXLEY). ; premaxilhv ; J/r/>, maxillo-palatiue; R,rostrum ; Vo, vomer; Jl, palatine; Pf,pterygoid ; *, basipterygoid process. Pmx,. FIG. 78.—SKULL OF Dacclo (AFTERHUXLEY). Ln, laoiymal. Other letters as iu previousfigure. their skull would lead us to believe. Neither are any of thesubdivisions, except that of the dromseognathse, really satis-factory from the classificatory point of view. Their in-efficiency, however, is rendered harmless by the fact that OSTEOLOGY 141 they are in reality not such hard and fast distinctions ;ismight be gathered from the foregoing abstract and fromtextbooks in general. PARKER has distinguished four categories of desmo-gnathism—(a) perfect direct, the maxillo-palatines unitingbelow in the middle line ; (b) perfect indirect, maxillo-palatines separated by a chink in the middle line ; (c) im-perfectly direct, maxillo-palatines sutured together in the V,, Six
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
