First lesson in zoology : adapted for use in schools . Fig. 92.—Common Hermit-crab. (Natural size.) uses it as a protection—^hke Diogenes, carrying its houseabout with it. Small hermit-crabs are abundant in littleshells in tidal pools along our coast. They may be put intosaucers filled with water and their movements watched. Less nearly related to the lobster are the beach-fleas,the little active, hopping creatures one finds everywhere un-. FiG. 93.—6ammarus, from fresh water. (Much enlarged.) der sea-weed on the sea-shore. Similar forms (Fig. 93) arecommon among weeds in fresh-water ponds. 88
First lesson in zoology : adapted for use in schools . Fig. 92.—Common Hermit-crab. (Natural size.) uses it as a protection—^hke Diogenes, carrying its houseabout with it. Small hermit-crabs are abundant in littleshells in tidal pools along our coast. They may be put intosaucers filled with water and their movements watched. Less nearly related to the lobster are the beach-fleas,the little active, hopping creatures one finds everywhere un-. FiG. 93.—6ammarus, from fresh water. (Much enlarged.) der sea-weed on the sea-shore. Similar forms (Fig. 93) arecommon among weeds in fresh-water ponds. 88 FIBST LESBOm IN Z00L0Q7. Crustaceans also occur everywhere under leaves audstones in damp places; these are the sowbugs. Some ofthem, when disturbed, roll into a ball like a pill, hencethey are called pill-bugs. Lastly, we come to the mostdistant relations of the lobster. The barnacles would, at first glance, hardly be regardedas Crustacea at all, so much modified is the body, owing totheir fixed, parasitic mode of life. The barnacle is () a shell-like animal, the shellcomposed of several pieces, witha conical movable lid, having anopening through which severalpairs of long, many-jointed,hairy legs are thrust, thus cre-ating a current which sets intowards the mouth. The com-mon barnacle abounds on everyrocky shore from extreme high-water mark to deep water, and fio. 94.—a Bamacie, student can, by putting a (Na
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894
