. Sea-shore life; the invertebrates of the New York coast. Marine animals. lt>8 SEA-SHORE LIFE The minute animal and vegetable organisms that are drawn in with the water do not pass through the gill slits, but are caught in the slime that lines the throat and passed around, entangled in a cord of slime, into the stomach. The heart is a spindle-shaped tube under and near the stomach. Curiously enough it pumps blood in one direction for a few moments, then rests, and pumps in the opposite direction. The blood corpuscles are mainly colorless and con- stantly change their shape re- sembl
. Sea-shore life; the invertebrates of the New York coast. Marine animals. lt>8 SEA-SHORE LIFE The minute animal and vegetable organisms that are drawn in with the water do not pass through the gill slits, but are caught in the slime that lines the throat and passed around, entangled in a cord of slime, into the stomach. The heart is a spindle-shaped tube under and near the stomach. Curiously enough it pumps blood in one direction for a few moments, then rests, and pumps in the opposite direction. The blood corpuscles are mainly colorless and con- stantly change their shape re- sembling amoehce. Some of the blood corpuscles are, how- ever, of definite shape and are often deeply colored, being reddish, indigo, brown or even white. It has been form d that when bacteria or other disease germs are introduced into the blood system, the colorless blood corpuscles seize upon them, and attempt to engulf them. Sometimes, however, they do not succeed but are themselves destroyed in the attempt to digest the bacteria, and then the disease conquers in the strife. The genital organs are found close to the side of a loop of the intestine, and their duct opens at the dorsal spout. In common with many sedentary and degenerate animals all tunicates are hermaphrodites, but the same individual does not usually fertilize its own eggs. The "brain" or principal ganglion of the Tunicate is situated midway between the two spouts, and is simply the remnant of the larval brain. It is, however, of so little importance that if it be cut out the creature lives quite well, and is even capable of contract- ing in a,normal manner when touched. The "brainless" animal. J-jg. iiS; CIONA INTESTIXALIS. Woods Hoi], 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 Mayor, Alfred Goldsborough, 1868-19
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