. Zoology. Zoology. 52 ZOOLOGY. Our commonest sea-worm, sometimes culled the "clam- worm" is Nereis virens (Fig. 5C). It lives between tide- marks in holes in the mud, and can be readily obtained. The body, after the head, eyes, tentacles, and bristle-bear- FiQ. 55. —Clymenella torquata, natural size. ing feet have been carefully studied, can be opened along the back by a pair of fine scissors and the dorsal and ven- tral red blood-vessels with their connecting branches ob- served, as well as the alimentary canal and the nervous system. This worm is very voracious, thrusting out its
. Zoology. Zoology. 52 ZOOLOGY. Our commonest sea-worm, sometimes culled the "clam- worm" is Nereis virens (Fig. 5C). It lives between tide- marks in holes in the mud, and can be readily obtained. The body, after the head, eyes, tentacles, and bristle-bear- FiQ. 55. —Clymenella torquata, natural size. ing feet have been carefully studied, can be opened along the back by a pair of fine scissors and the dorsal and ven- tral red blood-vessels with their connecting branches ob- served, as well as the alimentary canal and the nervous system. This worm is very voracious, thrusting out its pharynx. Fig, 5G.—Transverse section throug:h tlie liiody of a Nereis, d, dorsal vessel or lieart; c', circular hiood-vessel; /(, ventral vessel; ?i. nervous cord or tranf^Iia; /, artery to swimming foot s"; i, intestine; s, setas or bristles. After Turn- bull, from Emertou. and seizing its prey witli its two hirge pharyngeal teeth. It secretes a viscid fluid lining its hole, up which it moves, pushing itself along by its bristles. At night it leaves its hole, swimming on the surface 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 Packard, A. S. (Alpheus Spring), 1839-1905. N. Y. , Holt
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1897
