. The structure and classification of birds . e. Nevertheless in the series of Tubinares the bronchialrings to which the intrinsic muscles are attached seem tomove further down. Forbes, 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 Forbes, 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 In a specimen oQNycticorax griseus on one si
. The structure and classification of birds . e. Nevertheless in the series of Tubinares the bronchialrings to which the intrinsic muscles are attached seem tomove further down. Forbes, 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 Forbes, 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 In a specimen oQNycticorax griseus on one side of the body I found atendon from the biceps runninglto the tensor brevis tendon, which may be com-parable to the above-described slip. C£. as to this Opisthoconws,. CEdicnemus, and Casuarms. TUBINAEE8 449 •structure. In Garrodia the first three bronchial rings arecomplete. In Thalassoeca glacialoides the last four trachealrings are incomplete behind, and are quite Hke the foursucceeding bronchial semi-rings, being, moreover, like Fig. 211.—Skdll of Diomedea exulans (after Huxley).Fo, vomer; Mxp, maxillo palatines ; Pt, pterygoid. Fig. 212.—Skull of Procellariagigantea (afteb Huxley). Pl^ palatines; *, basipterygoid letters as la 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 a 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 Aeipetes, though there is no external division ofthe trachea, there is an incomplete internal septum. InDiomedea, according to Swinhob, at any rate in tw
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
