. The structure and classification of birds . d in structure, and there is a small prolongationupwards of the lateral portions of the three lowermosttracheal rings, which forms a consolidated triangular processon each side, overlapping the next few rings and lookingextremely like the rudiment of the similarly situated proces-sus vocales of the passerinetracheophone syrinx, whichresemblance is increased bythe thinness of the neigh-bouring rings and by theirbeing flattened from beforebackwards. The bronchial syrinx is- seen in its most .extreme de-velopment in Steatornid. andin Crotophaga, where
. The structure and classification of birds . d in structure, and there is a small prolongationupwards of the lateral portions of the three lowermosttracheal rings, which forms a consolidated triangular processon each side, overlapping the next few rings and lookingextremely like the rudiment of the similarly situated proces-sus vocales of the passerinetracheophone syrinx, whichresemblance is increased bythe thinness of the neigh-bouring rings and by theirbeing flattened from beforebackwards. The bronchial syrinx is- seen in its most .extreme de-velopment in Steatornid. andin Crotophaga, where it wasoriginally described by MiJiJ-LBE ; but other cuckoos andgoatsuckers, as has beenshown by me, possess alsoa syrinx which may becalled bronchial; further-more, as WuNDBRLiCH hasshown,^ the owl tribe resem-ble the goatsuckers in this Fig. 48respect, while there are in-dications of the bronchial syrinx in certain petrels. The fullest description of the syrinx of Steatornis, whichwe take as a type of the perfectly formed bronchial Strinx of steatornis, FkontView. (Apteb Gakbob). On the Syrinx and other Points in the Anatomy of the OaprimulgidBS,P. Z. S. 1886, p. 147; On the Structural Characters and Classification of theCuckoos, P. Z. S. 1888, p. 168. ^ Beitrage zur vergleichenden Anatomie und Entwickeluugsgeschichte desunteren Kehlkopfs der Vogel, Nov. Act. Aqad. Leop. Cms. 1884. 70 STEUCTURE AND CLASSIFICATION OF BIRDS is contained in a paper upon the general anatomy of thisbird by Gabrod. From that paper we borrow the descrip-tion as well as the illustration. It will be seen from thatdrawing (fig. 48) that the trachea of the bird bifurcates, asdoes the trachea of a mammal, without any modification ofthe rings, either tracheal or bronchial. The latter are at firstcomplete rings ; it is not until the thirteenth or fourteenth—the exact position appears to vary—that the syrinx appears;here the rings cease to be complete rings, and are semi-rings,their inner ends
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
