. The structure and classification of birds . FIG. 79.—SKULL OF Alca, (AFTER HUXLEY). *, prefrontal (eetethmoid); <IH, quadrate : J/. Other letters as in previous FIG. 80.—SKULL OF Corvus (AFTEHHUXLEY). LETTERING AS BEFORE. middle line; (d) imperfectly indirect, maxillo-palatines closelyarticulated with and separated by the median is also the exaggerated desmognathism ( double des-mognathisna ) of the hornbills, &c., where not only themaxillo-palatines but also the palatines are united across themiddle line ; and finally the spurious desmognathism of
. The structure and classification of birds . FIG. 79.—SKULL OF Alca, (AFTER HUXLEY). *, prefrontal (eetethmoid); <IH, quadrate : J/. Other letters as in previous FIG. 80.—SKULL OF Corvus (AFTEHHUXLEY). LETTERING AS BEFORE. middle line; (d) imperfectly indirect, maxillo-palatines closelyarticulated with and separated by the median is also the exaggerated desmognathism ( double des-mognathisna ) of the hornbills, &c., where not only themaxillo-palatines but also the palatines are united across themiddle line ; and finally the spurious desmognathism ofcertain segithognathous birds (Megalcema), in which the 142 STRUCTURE AND CLASSIFICATION OF BIRDS vomers are asgithognathous, but the maxillo-palatines areunited. As of desmognathism so of aegithognathism, PARKERdistinguishes four kinds— Incomplete segithognathism (Hemipodes) is distinguishedby the fact that the broad double vomer has a septomaxil-lary at each angle, which is only strongly tied to alinasalcartilages. Complete Var.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
