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Show 1889.] ANATOMY OF PICARIAN BIRDS. 591 common with the innermost head of the gastrocnemius. The semitendinosus is attached by a thin tendon to the tibia as in Aceros and by a short tendon, also as in that species, to the gastrocnemius. The accessory semitendinosus arises chiefly from this latter tendon, but there is no division between this part of the muscle and that which takes its origin from the fleshy part of the semitendinosus. Fig. 3. addJ Leg-muscles of Aceros nipalensis. add, Adductor longus; Ast, accessory semitendinosus; St, semitendinosus; gast, gastrocnemius; Sm, semimembranosus. In Buceros atratus there is again some little difference from both the types already described, although the resemblances are on the whole closer to Aceros. The adductor longus is attached by two tendinous heads; the upper one of these, as in Aceros, is attached to the lower border of the femur; this corresponds to the fleshy insertion of the muscle in Bucorvus; the lower tendon is fused on its way with the inner head of the gastrocnemius, which is continued upwards and reaches the femur, and then bifurcates into two tendons of insertion. The relations of the semitendinosus and of the accessory semitendinosus are as in Aceros nipalensis. In Toccus these muscles are much the same as in Buceros. In Ceratogymna elata I find a closer resemblance to Aceros than to any other of the genera mentioned in this paper, but there is an |
