. The common frog. Frogs. lOO THE COMMON FROG. [chap. fibres enclosed, assume the forms of cones. Moreover, the apices of the membranes enclosing the cones,. Fig. 63.—Superficial Muscles of Extensor Side of Leg and of parts of Trunk and Tail of Menopoma. ES, erector spinse—directly continued into dorsal half of tail; ELD, extensor longus digitorum pedis ; FC, femoro-caudal; , pro- bably rectus femoris ; /, muscle resembling iliacus ; ILC, ilio-caudal; IP, ilio- peroneal; KF, part of great extensor of thigh ; SM and ST, muscles like the semi-membranosus and semi-tendinous. become denser in


. The common frog. Frogs. lOO THE COMMON FROG. [chap. fibres enclosed, assume the forms of cones. Moreover, the apices of the membranes enclosing the cones,. Fig. 63.—Superficial Muscles of Extensor Side of Leg and of parts of Trunk and Tail of Menopoma. ES, erector spinse—directly continued into dorsal half of tail; ELD, extensor longus digitorum pedis ; FC, femoro-caudal; , pro- bably rectus femoris ; /, muscle resembling iliacus ; ILC, ilio-caudal; IP, ilio- peroneal; KF, part of great extensor of thigh ; SM and ST, muscles like the semi-membranosus and semi-tendinous. become denser in substance, and so modified into ligaments.^ We come thus to have a key to the process of development, by which the muscles of the back may be conceived to have arisen. The muscles of the back may be conceived as having arisen through increasing obliquity, conical prolongation, and partial detachment (from muscle) of the separating membranous lamellae ; the produced ends becoming condensed into firm tendons directed more or less obliquely Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mivart, St. George Jackson, 1827-1900. London, Macmillan and co.


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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondo, bookyear1881