OCR Text |
Show 1881.] TRACHEA IN THE "RATITE " BIRDS. 779 Struthio camelus (figs. 1, 2), on account of its size and simple structure, may be described here first. The trachea, inferior to the Fig. 1. Bifurcating trachea of Struthio camelus, from before. b. Section of wall of trachea, from behind, to show the vocal cord formed by the thickening of the mucous membrane of the interior. I. II., first two bronchial semirings. 1, 2, & c , last tracheal rings. Here, and elsewhere in these figures, o indicates the last, oo the penultimate, ooo the antepenultimate tracheal rings. The same, from behind. About natural size. insertion of the stemo-tracheales, slightly narrows, having above the antepenultimate ring a diameter of about one inch. The tracheal 50* |