. The fauna of British India, including Ceylon and Burma . windpipe. But while in the Mammals tlie larynx is acomparatively stable structure, in the birds the syrinx presents avery remarkable range of differences both in regard to its funda-mental structural characters, as well as of musculatui-e. For the present it nuist sulfice to give a brief survey of theessential features of the syrinx in the Passeres and, for systematicpurposes, tlie musculature is the dominant factor. • The syrinx, then, in this Group presents wide contrasts,even among Grenera of the same Family, but nevertheless itconf
. The fauna of British India, including Ceylon and Burma . windpipe. But while in the Mammals tlie larynx is acomparatively stable structure, in the birds the syrinx presents avery remarkable range of differences both in regard to its funda-mental structural characters, as well as of musculatui-e. For the present it nuist sulfice to give a brief survey of theessential features of the syrinx in the Passeres and, for systematicpurposes, tlie musculature is the dominant factor. • The syrinx, then, in this Group presents wide contrasts,even among Grenera of the same Family, but nevertheless itconforms in its essential characters with that of the Aves as awhole. That is to say, it is formed of a number of bony orcartilaginous rings and semi-rings—some of which may be com-pletely or partially welded—held together by thin membraneswhich serve not merely to support the framework, but also in theproduction of the voice. In the Anisomyodi the syringeal muscles are inserted either inthe middle or on to the dorsal or ventral ends of the
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Keywords: ., bookauthoroateseug, bookcentury1900, bookdecade1920, bookyear1922
