. A manual of zoology. PHYLUM CHORDATA 3ji between the lizard and the rabbit consists in the presence of two pairs of jointed limbs, anterior and posterior, the principal divisions of which correspond in their general arrangement. In the dogfish these are found to be rep- resented by very different-looking structures, the paired fins. At this point all external resemblance ceases, and we see nothing but differences. The skin of the dogfish, though almost smooth, is harsh to the touch, and, when we examine it with a lens, this is found to be due to the presence of innumerable minute hard gran-.
. A manual of zoology. PHYLUM CHORDATA 3ji between the lizard and the rabbit consists in the presence of two pairs of jointed limbs, anterior and posterior, the principal divisions of which correspond in their general arrangement. In the dogfish these are found to be rep- resented by very different-looking structures, the paired fins. At this point all external resemblance ceases, and we see nothing but differences. The skin of the dogfish, though almost smooth, is harsh to the touch, and, when we examine it with a lens, this is found to be due to the presence of innumerable minute hard gran-. FlG. 208. — Lepus cuniculus. Lateral view of skeleton with outline of body. ules, set closely together so as to give the surface the charac- ter of a fine file. The general shape of the body is adapted to cleaving the water rapidly, — long and narrow, nearly fusiform, pointed at the ends, — and the fins are obviously swimming organs. The fins are all of the same general character, so far as their superficial appearance is con- cerned ; they are all of the nature of flap-like outgrowths, thick at the base, where they are obviously supported by hard parts, thinner towards the margins, where their sole. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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