. The common frog. Frogs. VII.] THE COMMON FROG. 99 with a mass of muscular fibres not arranged in super- imposed sheets, but as a series of narrow segments separated from each other by layers of membrane. The edges of these membranous layers, when the skin is removed, appear as a successive series of undulating lines proceeding from the back to the FiG. 62.âTadpole of Bull Frog, partly dissec-ted, to show the muscles of the tail and the branches of the 8th ner\ e or the vagus, a, great lateral branch giving offâ b, a dorsal branch, and c, the lateral branch (or nervns lateralis) ; d,
. The common frog. Frogs. VII.] THE COMMON FROG. 99 with a mass of muscular fibres not arranged in super- imposed sheets, but as a series of narrow segments separated from each other by layers of membrane. The edges of these membranous layers, when the skin is removed, appear as a successive series of undulating lines proceeding from the back to the FiG. 62.âTadpole of Bull Frog, partly dissec-ted, to show the muscles of the tail and the branches of the 8th ner\ e or the vagus, a, great lateral branch giving offâ b, a dorsal branch, and c, the lateral branch (or nervns lateralis) ; d, branches descending and passing ajong the branchial arches. The descending branches seen behind the branchial nerves on the side of the belly are not branches of the vagus at all, but spinal nerve>, which come out from beneath the muscles and pass down under the nervtts lateralis, and without having any communication with it. â Now the tadpole exhibits a muscular condition quite similar to that of the fish, and in the great persistent larva the axolotl, we find no truly oblique abdominal muscles, but only as it were a hyper- trophied rectus. In other species of the frog's class, which retains a tail throughout life, the marked superimposed lamellae are distinctly developed, but more or less distinct traces are also retained of the successive membranous partitions separating the muscular segments of both the dorsal and ventral regions. Another stage of development be detected in the tail-muscles of certain reptiles. Here the membranous partitions have become drawn out at short intervals from above downwards into a funnel-shaped condition, so that the muscular H 2. 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
