. The structure and classification of birds . merely of thecoracoidal head, the humeral head being represented only bythe biceps The muscle is not large, and in Phaleris its muscularbelly is largely divided into two. The humeral head of the anconceus seems to be nearlyalways present. There is no expansor secimdariorum. The deltoid has,as a rule, no scapular slip, but there is one in Uria. The muscles of the leg which are invariably present are the femoro-caudal and the semitendinosus. The accessory head of the latter is never present. The ambiens and the accessory femoro-caudal may be p


. The structure and classification of birds . merely of thecoracoidal head, the humeral head being represented only bythe biceps The muscle is not large, and in Phaleris its muscularbelly is largely divided into two. The humeral head of the anconceus seems to be nearlyalways present. There is no expansor secimdariorum. The deltoid has,as a rule, no scapular slip, but there is one in Uria. The muscles of the leg which are invariably present are the femoro-caudal and the semitendinosus. The accessory head of the latter is never present. The ambiens and the accessory femoro-caudal may be present, and, except in It is (? individually) absent in Brachyrhamphus marmoratus. ALO^. 363 Phaleris psittacula, nice never both absent; the formula arethe three following :— ABX- Uria. AX + Ceratorhina. AX— Phaleris. The biceps femoris of Brachyrhamphus gives off a fleshyslip to the outside of the thigh, to the gastrocnemius (). This slip is not to be found in Phaleris. The least modified form of syrinx is seen in Alca tarda,.


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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898