. Animal physiology. Physiology, Comparative; Physiology, Comparative. Fig. 61.—Octopus or Poulp. represented in the accompanying figure ; and the body is then short and thick. In other instances the arms are short, and the body long and flexible, and furnished with a fin-like expansion behind, as in the calamary or squid. The common Cuttle-fish and its allies are destitute of any external protection ; but they usually have a flat shell, commonly known as the cuttle-fish bone, enclosed in a fold of the mantle, and lying along the back. In the Cala- mary, this is horny in its texture, and is su
. Animal physiology. Physiology, Comparative; Physiology, Comparative. Fig. 61.—Octopus or Poulp. represented in the accompanying figure ; and the body is then short and thick. In other instances the arms are short, and the body long and flexible, and furnished with a fin-like expansion behind, as in the calamary or squid. The common Cuttle-fish and its allies are destitute of any external protection ; but they usually have a flat shell, commonly known as the cuttle-fish bone, enclosed in a fold of the mantle, and lying along the back. In the Cala- mary, this is horny in its texture, and is sufficiently flexible to offer no resistance to the action of the fin-like tail, by which the animal is propelled through the water, very much in the manner of a fish. Some of the Cephalopods now existing, however, and a still larger proportion of those which peopled our seas in past ages, were enclosed in spiral shells; and these shells, preserved. Fig. 62.— 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 Carpenter, William Benjamin, 1813-1885. London : Wm. S. Orr and Co.
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