. First lessons in zoology. Zoology. IVORMS, CRAYFISH, CENT IP EDS, ETC. 149 The earthworms, leeches, vinegar-eels, hairworms, and trichina belong to the great branch Vermes. The crayfish.—The crayfish, or crawfish, is found in most fresh-water ponds and streams of the United States west of Massachusetts. Crayfishes may be taken by a net baited with dead fish, or may be caught in a trap. Fig. III.—A group of marine worms; at the left a gephyrean, Dendroslonimn cronjhchni, the upper right-hand one a nereid, Nereis sp., the lower right-hand one, Polynoe brevisetosa. (From living specimens in a t
. First lessons in zoology. Zoology. IVORMS, CRAYFISH, CENT IP EDS, ETC. 149 The earthworms, leeches, vinegar-eels, hairworms, and trichina belong to the great branch Vermes. The crayfish.—The crayfish, or crawfish, is found in most fresh-water ponds and streams of the United States west of Massachusetts. Crayfishes may be taken by a net baited with dead fish, or may be caught in a trap. Fig. III.—A group of marine worms; at the left a gephyrean, Dendroslonimn cronjhchni, the upper right-hand one a nereid, Nereis sp., the lower right-hand one, Polynoe brevisetosa. (From living specimens in a tide- pool on the Bay of Monterey, California.) from a box with ends which open in, and baited with dead fish or animal refuse of any sort. They should be brought alive into the schoolroom and kept in a moist chamber. Observe live specimens to see the character- istics of locomotion, and the use of the pincers and the mouth-parts in taking food. Kill some specimens with chloroform and study the ex- ternal structure. Note that the body is made up of a series of body-rings or segments (as in the case of insects and worms), which are distinct in the hinder part of the body (abdomen), but are fused in the front forming the cephalothorax. The whole body is covered with a firm, calcareous exoskeleton, which acts as a protective cover- ing for the soft parts within, and also as a firm place for the attachment of the 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 Kellogg, Vernon L. (Vernon Lyman), 1867-1937. New York, H. Holt and Company
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