. Elementary zoology. Zoology. *3l ELEMENTARY ZOOLOGY the insects and crabs. Almost all of the worms have the power of locomotion; usually that of crawling. For this crawling they do not have legs composed of separate segments or joints as do the higher articulated animals,. Fig. 29.—A group of marine worms; at the left a gephyrean, Dendrostomun, cronjhelmi, the upper right-hand one a nereid, Nereis sp., the lower right-hand one, Polynoe brevisetosa. 'From tide-pool on the Bay of Monterey, California.) living specimens in a the crabs and insects, but either have fleshy unjointed legs, or vario
. Elementary zoology. Zoology. *3l ELEMENTARY ZOOLOGY the insects and crabs. Almost all of the worms have the power of locomotion; usually that of crawling. For this crawling they do not have legs composed of separate segments or joints as do the higher articulated animals,. Fig. 29.—A group of marine worms; at the left a gephyrean, Dendrostomun, cronjhelmi, the upper right-hand one a nereid, Nereis sp., the lower right-hand one, Polynoe brevisetosa. 'From tide-pool on the Bay of Monterey, California.) living specimens in a the crabs and insects, but either have fleshy unjointed legs, or various kinds of bristles or spines, or suckers, or even no external organs of locomotion at all. As regards their internal structure they have well-organized systems of organs, which show great variety in character and degree of complexity. The special sense-organs are usually of simple character and low degree of functional development. Reproduction occurs both sexually and asexually; in some species the sexes are distinct, while in others both sperm-cells and egg-cells are produced by the same individual. Asexual reproduction is by budding or by a kind of simple division or fission. The worms live either in salt or fresh water, or in moist, muddy or slimy places or as parasites in the bodies of other animals or in plants. While most worms feed on animal sub-. 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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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
