. An introduction to the osteology of the mammalia . u FIG. 95. —Bones of fore-arm and manus of Mole {Tajpa euro/cca) X 2. R radius ;U ulna ; s scaphoid ; / lunar ; c cuneiform ; f> pisiform ; u unciform ; m magnum :rd trapezoid ; tin trapezium ; ^central; rs radial sesamoid (falcifonn) ; i—v thedigits. In the CHIROPTERA, the hand is especially modified in atotally different manner, constituting the organ of flight. In the carpus the scaphoid and lunar are united, and insome genera (as Ptcropus) the cuneiform is joined with them,so that the proximal row contains but a single bone. Thereis n
. An introduction to the osteology of the mammalia . u FIG. 95. —Bones of fore-arm and manus of Mole {Tajpa euro/cca) X 2. R radius ;U ulna ; s scaphoid ; / lunar ; c cuneiform ; f> pisiform ; u unciform ; m magnum :rd trapezoid ; tin trapezium ; ^central; rs radial sesamoid (falcifonn) ; i—v thedigits. In the CHIROPTERA, the hand is especially modified in atotally different manner, constituting the organ of flight. In the carpus the scaphoid and lunar are united, and insome genera (as Ptcropus) the cuneiform is joined with them,so that the proximal row contains but a single bone. Thereis no centrale. The pisiform is very small. XVI.] CHIROPTERA. 291 The pollex is short, divaricated from the other digits, notenveloped, as they are, in a cutaneous expansion, and armedwith a curved claw. The other digits are extremely long andslender. In the Frugivorous Bats (Fteropidaz) the second digit has ashort ungual phalanx and claw, but in each of the other si .m. JL Iff JJJ FIG. 96. B-nes of the manus of Beaver (Cas for cattadensts), J. digits the middle phalanx is elongated, and gradually tapersto the termination, the ungual phalanx being absent. In the Insectivorcus Bats, the pollex alone has a claw,and the elongation of the other digits is chiefly due to themetacarpals, the phalanges being small and very slender,and usually only two in number, except in the third digit,which occasionally (as in P/iyllosfomidce1} has three. i G. E. Dobson, Catalogue of Chiroptera, Brit. u 2 292 THE MANUS. [CHAP. In the RODENTIA, the scaphoid and lunar are verygenerally united (as in Castor, Dasyprocta, Hydrochoerus,Capromys, Sciurus, Arctomys, Mus, &c.), but not in all. Anos centrale is present in many, as Lepus, Dasyprocta, Hydro-chorus, Capromys, and Castor, while in other genera it isabsent. There is very frequently an accessory ossicle on theradial side of the carpus, which is particularly large in theBeaver (Fig. 96). There are nearly alwa
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbones, bookyear1885
