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Show 172 MR. F. E. BEDDARD ON THE CUCKOOS. [Feb. 17, Eudynamis taitensis.-The svrinx is on the whole similar to that of Cuculus. The last tracheal"ring and the first three bronchial semirings are completely ossified ; there is a strong bony pessulus present; the syringeal muscles are attached to the third bronchial semiring ; the succeeding bronchial semirings are slight and cartilaginous ; from the first of these an oval thick ossified piece projects into the substance of the membrana tympaniformis. Phcenicophaes, as far as could be made out from a single damaged syrinx, presents no important differences from Eudynamis. In Pyrrhocentor celebensis the syrinx is bronchial ; on the dorsal side the last tracheal rings are incomplete and pass gradually without any break into the bronchial semirings ; there is a slender pessulus attached to the last tracheal ring ventrally ; ventrally the tracheal rings are complete ; the bronchial semirings increase gradually in breadth up to the 16th ; the 16th and 17th rings are considerably stouter than the rest; the remaining rings of the bronchi are very a. Front. b. Back. Syrinx of Centropus ateralbus. slight; the inner ends of the bronchial semirings are connected by a continuous membrane, which is extremely narrow until about the 13th ring, when it widens out and forms the membrana tympaniformis ; this region of the bronchus forms the vocal organ. There is a single pair of syringeal muscles which form a flat thin layer nearly completely covering the ventral surface of the bronchi and attached below to the 16th bronchial semiring. In Centropus ateralbus (fig. 2) the syrinx is much like that of Geococcyx and Pyrrhocentor, and, as might be expected, is more particularly similar to that of the last genus. The bronchial rings |