. The fauna of British India, including Ceylon and Burma . dice-sbapedbox of the tracheal tube. By its vibrations it acts like the freereed oT an organ-pipe. Muscular lips extending from theinner surfaces of bronchial semi-ring III narrow the aperture oneither side of the reed during the production of the Aoice or song, and thus complete the mechanism of voice tlie Tracheal syrinx a variable number of the lower tracheal PASSEEES. 13 rings fire reduced in thickness, leaving wide spaces filled by mem-brane. The range of sounds produced l)y this modification ismuch more limited than
. The fauna of British India, including Ceylon and Burma . dice-sbapedbox of the tracheal tube. By its vibrations it acts like the freereed oT an organ-pipe. Muscular lips extending from theinner surfaces of bronchial semi-ring III narrow the aperture oneither side of the reed during the production of the Aoice or song, and thus complete the mechanism of voice tlie Tracheal syrinx a variable number of the lower tracheal PASSEEES. 13 rings fire reduced in thickness, leaving wide spaces filled by mem-brane. The range of sounds produced l)y this modification ismuch more limited than in the Iracheo-bronchial syrinx. Tn the Bronchial syrinx the voice is produced by niodifiralionof the bionchi. But as this type does not occur among thePasseres, its description may be deferred. It is not tlie purpose of this survey to pass in review all theanatomicil characters which have been used as aids to the classifi-cation of this difficull Group, but rather to afford a concise summaryof such as are regarded to-day as of importance. ankle. tarso-metatarsus Sketcli showing the arrangement of the deepplantar tendons in apasserine bird. (From P. Z. S. 1875, p. 347.) After the syrinx, systematists seem to have relied most uponthe plantar tendons of the foot. Sometimes, indeed, too muchreliance seems to have been placed upon these ; that is to say, atoo arbitrary use has been made of the evidence they afford. Of these tendons two only are specially recognized in this con-nexion. These are the Flexor profundus digitoriim and the Flexorlongns hallucis. The first nanicul arises from the greater part ofthe hinder face of the fibula and tibia, beneath ail the otherflexors, and at the intertarsal joint passes into a tendon, which,running through a perforation in the metatarsal tubercle, dividesjust above the distal end of the tarso-nietatarsus, sending a slip 14 PASSERES. to eaoli front toe. The Flexor Jongiis JutUucis arises from theouter condyle of the ienuir and from the
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Keywords: ., bookauthoroateseug, bookcentury1900, bookdecade1920, bookyear1922
