. Anatomical and zoological researches: comprising an account of the zoological results of the two expeditions to western Yunnan in 1868 and 1875; and a monograph of the two cetacean genera, Platanista and Orcella. 542 CETACEA. had noted a few diminutive muscular slips as alone extant between the scapula and humerus; the lower bony segments being supposed to be held together solely by aponeuroses, and therefore to be comparatively immobile. Flatanista I have found to be another genus, wherein the manus is provided with tendons indicative of true flexor muscles. Separate extensor tendons on the
. Anatomical and zoological researches: comprising an account of the zoological results of the two expeditions to western Yunnan in 1868 and 1875; and a monograph of the two cetacean genera, Platanista and Orcella. 542 CETACEA. had noted a few diminutive muscular slips as alone extant between the scapula and humerus; the lower bony segments being supposed to be held together solely by aponeuroses, and therefore to be comparatively immobile. Flatanista I have found to be another genus, wherein the manus is provided with tendons indicative of true flexor muscles. Separate extensor tendons on the dorsal surface of the manus are by no means defined or clear. A comparatively aborted extensor communis digitorum muscle appears as a very thin, but broad layer of fleshy fibres which covers the ulna. At the cuneiform and os magnum, partly by their textural characteristics and longitudinal direction, three very thin and very much flattened tendons are observed to diverge and supply the third, fourth and fifth digits respectively, at least as far as their second phalanx. Both the pseudo-belly and tendons of this extensor are very considerably interwoven with the lateral and superincumbent fibrous tissue. The latter, moreover, is firmly adherent to, and with the greatest difiiculty separated from, the skin itself. Fig. 20. Fig. Fig. 19.—The right forearm of Flatanista dissected on its inner surface to show musculo-tendinous parts as de- scribed in text. I, II, III, IV, V digits respectively ; Jld, flexor longus digitorum; feu, flexor carpi ulnaris ; ecu, extensor carpi ulnaris; hy, vessels supplying limb. Fig. 20.—A view of the foreshortened narrow ulnar margin of limb, where the relations of {feu ) flexor and [ecu) extensor carpi ulnaris are brought out. Both figures from a fully adult animal are necessarily greatly reduced. A flexor longus digitorum is stiU better marked, though by no means a promi- nent muscle. A longitudinal flat adpressed band of fleshy fibres a tr
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Keywords: ., bookcentury1800, bookcollectionbiod, bookdecade1870, bookyear1878
