| OCR Text |
Show 1883.] ANATOMY OF PHOENICOPTERUS. 639 fused together, and calcified, the fourth being incomplete behind. Above these are eight or nine rings, which are also incomplete posteriorly ; so that above the syrinx there is at the back of the trachea an elongated membranous space. Below the last tracheal ring there is a membranous tube, connecting the last tracheal with the first bronchial rings. Of these the first is incomplete internally, both in front and behind; while the next three are thickened, and join a large pessulus in the middle line. Both the pessulus and the first four bronchial rings are complete. In Phoenicopterus the last three bronchial rings are calcified and Fig. 1. Diagrams of the syrinx of Leptoptilus and Phoenicopterus. Art, Front, and Ac, side view of that of Phoenicopterus; Ab, front view of that of Leptoptilus. ankvlosed ; there is no pessulus, and the first twenty bronchial rings are "incomplete internally. There is also a single pair of intrinsic muscles (fig. 1, A«, Ac). . The lungs present nothing remarkable, but the air-cells and their associated septa are strikingly characteristic. On slitting open the abdominal wall of a Stork (Leptoptilus, for example) in the middle ventral line, the only viscera exposed are the two lobes of the liver and the ventral portion of the gizzard. All 42* |
