. Elements of comparative zoology. Zoology. CRUSTACEA. 229 other Crustacea molt or shed their skin in the same way, the new skin rapidly growing hard again, but the blue. FIG. 56.—Shore-crab (Cancer irroratus}. crab is the only one taken in sufficient abundance at this time to be of economic importance. ORDER Contrasted to the Decapods are the fourteen-footed or tetradecapodous forms, of which the sow-bug is one type. In these we can distinguish clearly head, thorax, and abdomen, the joints of the thorax being freely movable on each other. The eyes are not placed upon movabl
. Elements of comparative zoology. Zoology. CRUSTACEA. 229 other Crustacea molt or shed their skin in the same way, the new skin rapidly growing hard again, but the blue. FIG. 56.—Shore-crab (Cancer irroratus}. crab is the only one taken in sufficient abundance at this time to be of economic importance. ORDER Contrasted to the Decapods are the fourteen-footed or tetradecapodous forms, of which the sow-bug is one type. In these we can distinguish clearly head, thorax, and abdomen, the joints of the thorax being freely movable on each other. The eyes are not placed upon movable stalks, but are scarcely elevated above the general sur- face of the head. Most of these forms are marine; a few live in fresh water, and still fewer, like the sow-bugs and pill-bugs, upon the land. All are small, those which reach two inches in length being the veritable giants among the group.* * An isopod from the greater depths of the ocean reaches a length of six 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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