. The structure and classification of birds . bicornis, and inToccus. In B. atratus thereis in addition an excessivelysmall patagialis longus muscle,arising with brevis and con-sisting indeed of but very fewfibres. In Bucorvus, on theother hand (fig. 100), the tensorpatagii longus is well tendon has a slip frompectoralis (a and a in fig. 100),but that which joins brevisreceives a tendinous slip fromthe biceps. This, however, asit is not figured by FUEBRINGER,is possibly individual. Quite exceptionally—amonganomalogonatous birds—manyhornbills have a broad humeralattachment of the
. The structure and classification of birds . bicornis, and inToccus. In B. atratus thereis in addition an excessivelysmall patagialis longus muscle,arising with brevis and con-sisting indeed of but very fewfibres. In Bucorvus, on theother hand (fig. 100), the tensorpatagii longus is well tendon has a slip frompectoralis (a and a in fig. 100),but that which joins brevisreceives a tendinous slip fromthe biceps. This, however, asit is not figured by FUEBRINGER,is possibly individual. Quite exceptionally—amonganomalogonatous birds—manyhornbills have a broad humeralattachment of the muscle itself arises fromthe scapula by a Y-shaped (Bucorvus, Buceros) or flat, non-divided (Aceros) head. Thehumeral ankerung is found in B. subcylindricus, B. bicor-nis, not in B. tlatus, B. malabaricus, B. atratus, Bucorvusabyssinicus, Aceros, or Toccus. The deltoid has no scapularslip. The leg formula of all hornbills is AXY—.The glut ecus maximus is quite absent; the gluticus ex-ternus is only present as a FIG. 100.—PATAGIAL MUSCLES OFBucorvus (AFTER BEDDAKD). //, humerus ; Jii, biceps ; Bs, biceps slips (?), , tensor patagii brevis tendon ; «, a,slips from pectoralis. BUCEROTES -217 The biceps is occasionally ( B. el at us) double at itsorigin, the tendons being separated by quite a quarter of aninch. The arrangement of the semitendinosus and adductor inAceros nipalensis, which is somewhat complex, will beunderstood from the accompanying drawing (fig. 101). The semitendinosus (St) is inserted on to the tibia by along, thin, flat tendon; another tendon, joining the first justwhere it passes into the muscle, is attached to the gastro-cnemius. The accessory semitendinosus is in two parts : the largerhalf (Ast) is attached to the semitendinosus just behind theorigin of the tendon of insertion of the latter ; the secondhalf appears to arise from the tendon which connects thesemitendinosus with the gastrocnemius, it passes up towar
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
