. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . The palps are sense-organs andperhaps test the food. The second part of the head, or peristo-mitim, bears on the sides four pairs of long tentacles which areused as feelers. The mouth is on the ventral side, and through itNereis throws out its pharynx, which contains a horny, notchedjaw. It seizes its prey with this jaw, which, with the pharynx,is then withdrawn and tears the food apart, acting like a body of Nereis is rounded above and nearly flat below. Eachof th
. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . The palps are sense-organs andperhaps test the food. The second part of the head, or peristo-mitim, bears on the sides four pairs of long tentacles which areused as feelers. The mouth is on the ventral side, and through itNereis throws out its pharynx, which contains a horny, notchedjaw. It seizes its prey with this jaw, which, with the pharynx,is then withdrawn and tears the food apart, acting like a body of Nereis is rounded above and nearly flat below. Eachof the segments has a, pair of parapodia, bearing a bundle of bris-tles and cirri. The last segment of the body is elongated, cylin-drical, and without parapodia, but has- on the end a pair of longcirri, which give the appearance of a divided tail. Each segmentof the body, except the head- and tail-segments, contains a pairof excretory tubes (nephridia), ganglia of nerves, and a portion ofthe intestine and of the vascular system. There are circularmuscles by which the worm can diminish its diameter, longitu- WORMS 177. Arereis pelayica. 1, male ;2, female. dinal muscles in four bands, and muscles tomove the parapodia. Breathing is carried onover the whole surface of the body, and es-pecially in parts of the lobes of the parapodiacalled gills. Its sense-organs are eyes, palps,tentacles, and cirri. N. virens. This species is found from NewYork northward in muddy arid shelly sand, audunder rocks between tide-marks, living in burrows,which it lines with a mucous secretion. It is veryactive and voracious, feeding on other worms,Crustacea, etc., which it captures with its horny,protruded jaw. At night it leaves its burrow andswims freely about like an eel, frequently fallinga prey to fishes. In color it is dull bluish-green,with some iridescence. The gills, which are leaf-like appendages on the parapodia, are green onthe anterior end of the body and become brightred farther back. This spe
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmarinea, bookyear1901
