. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. THE SKULL. 83 the nasal and oral cavities (incisive or naso-palatine canal). In the lateral parts of the face of most Mammals, the jugal or malar connects the maxilla with a process of the squamosal instead of with the quadrate, as in Amphibia and Sauropsida: in Ungulata FIG. 67.—SKULL OF EMBRYO OF ARMADILLO (Tatusia hybrida). (Modified from a drawing by W. K. Parker.) , tympanic annulus ; au, auditory capsule; , hasihyal ; , ceratohyal; cr, cricoid ; d, dentary ; , epihyal
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. THE SKULL. 83 the nasal and oral cavities (incisive or naso-palatine canal). In the lateral parts of the face of most Mammals, the jugal or malar connects the maxilla with a process of the squamosal instead of with the quadrate, as in Amphibia and Sauropsida: in Ungulata FIG. 67.—SKULL OF EMBRYO OF ARMADILLO (Tatusia hybrida). (Modified from a drawing by W. K. Parker.) , tympanic annulus ; au, auditory capsule; , hasihyal ; , ceratohyal; cr, cricoid ; d, dentary ; , epihyal ; , external nostril ; co, excceipital ; /, frontal; , hypohyal; ?', jugal; in, incus; Ic, lacrymal ; mk, Meckel's cartilage; ml, malleus; mx, maxilla; n, nasal; , occipital condyle; p, parietal ; pa, palatine ; ?v, premaxilla ; so, supraoccipital; st, stapes ; s.(, superior turbinal; , stapedius muscle ; sq, squamosal ; th, thyroid ; tr, trachea ; V1, foramen for first, and V2 for second, division of the trigeminal ; //, optic foramen. and Primates, when the jugal is also connected with a process of the frontal,1 the orbit becomes almost completely separated from the temporal fossa. 1 Most of the true Ruminants are provided with horns projecting from the frontal bones : these are of three kinds :—1, hollow horns (in the Cavicoruin) ; 2, solid horns (antlers of Cervidre) ; and 3, horns of the Giraffe. In the Cavicornia (Boviiire, Antelopinse, Caprinse, Ovinaj) bony processes are developed from the frontals, which become enveloped by horn formed from the epi- dermis. In the Cervida?, a membrane bone becomes developed in the derma round each process of the frontal, with which it fuses. This grows out to form the antler, and after attaining its full development, the skin covering it dries up owing to the develop- ment of the "burr" at its base ; this constricts the vessels, and the antler, being deprived of nutriment, falls off. This occurs periodicall
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondonnewyorkmacmi
