. The structure and classification of birds . ss in the series of Tubinares the bronchialrings to which the intrinsicmuscles are attached seem tomove further down. FOEBES, however, regards this as asplitting of the trachea, and holds that the intrinsic musclesare invariably fastened to the fifth semi-ring. It is in thegenus Pelecanoides, remarks FOEBES, that the typicalconstruction of the syrinx of the Tubinares is seen in itssimplest form. In this bird all the bronchial rings aresemi-rings, and there is a three-way piece of the usual 1 In a specimen oi^Nycticorax griscus on one side of the bo
. The structure and classification of birds . ss in the series of Tubinares the bronchialrings to which the intrinsicmuscles are attached seem tomove further down. FOEBES, however, regards this as asplitting of the trachea, and holds that the intrinsic musclesare invariably fastened to the fifth semi-ring. It is in thegenus Pelecanoides, remarks FOEBES, that the typicalconstruction of the syrinx of the Tubinares is seen in itssimplest form. In this bird all the bronchial rings aresemi-rings, and there is a three-way piece of the usual 1 In a specimen oi^Nycticorax griscus on one side of the body I found atendon from the biceps running I to the tensor brevis tendon, which may be com-parable to the above-described slip. - Cf. as to this 0£>isthocomus, CEdicnemits, and Ccisuarins. TUBINAKES 44!) structure. In Garrodia the first three bronchial rings are O complete. In Thalassoeca glacialoides the last four trachealrings are incomplete behind, and are quite like the foursucceeding bronchial semi-rings, being, moreover, like them,. -75 FIG. 211.—SKULL OF Diomedea cxulans (AFTER HUXLEY).Vo, vomer; ?,fxp, maxillo palatines ; 1t, pterygoid. FIG. 212.— SKULL OK Procellariagirjantea (AFTER HUXLEY). PI, palatines ; *, basipterygoid letters as iu fig. 211. ossified. This modification is carried to its furthest extremein Ossifraga. In this petrel the last nine or ten trachealrings are incomplete in front, and the last twelve or so areincomplete behind. Thus the membrana tympaniformisdoes not commence for some distance away from the bifur-cation of the respiratory tube, the rings being double and G G- 450 STRUCTURE AND CLASSIFICATION OF BIRDS complete for the same way in front of it. The division ofthe trachea is carried upwards above the point where it isexternally divided into two tubes by an internal in Adjust.*, though there is no external division ofthe trachea, there is an incomplete internal septum. InDiomedea, according to SWINHOE, at any
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
