. Animal forms; a second book of zoology. Zoology. ARTHROPODS. CLASS CRUSTACEA 105 some for known reasons, but more often not readily under- stood. And not only does the form vary, but the external surface may be sculptured or beset with spines or tubercles which frequently render the animal inconspicuous amid its natural surroundings. Such an effect is heightened by the presence of sponges, hydroids, and various seaweeds which the crab often permits to gather upon its body. 105. Pill-bugs and sandhoppers.—Finally there remain the groups of the pill- or sow-bugs (Isopods) and the sand-fleas or
. Animal forms; a second book of zoology. Zoology. ARTHROPODS. CLASS CRUSTACEA 105 some for known reasons, but more often not readily under- stood. And not only does the form vary, but the external surface may be sculptured or beset with spines or tubercles which frequently render the animal inconspicuous amid its natural surroundings. Such an effect is heightened by the presence of sponges, hydroids, and various seaweeds which the crab often permits to gather upon its body. 105. Pill-bugs and sandhoppers.—Finally there remain the groups of the pill- or sow-bugs (Isopods) and the sand-fleas or sandhoppers (Amphipods). In the first of these the body is usually small and compressed, the thorax more or less plainly segmented, and the seven walking (thoracic) legs are similar. In the female each leg bears at its base a thin membranous plate which extends inward and hori- • M m % w%~ii&s 9r- v. 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 Jordan, David Starr, 1851-1931; Heath, Harold, 1868- [from old catalog] joint author. New York, D. Appleton and company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
