. Zoology : for students and general readers . Zoology. 113 ZOOLOGY. suckers, excepting those at the end of the arms, which are tentacle-like. We have already described the common star- fish of our north-eastern coast, Asterias vulgaris Stimpson (Fig. 74). This and the allied varieties are abundant on mussel and oyster beds, being very injurious to the latter, which serve them as food. The star-fish projects its capa- cious stomach, turning it inside out, between the open valves of the oyster, and sucks in the soft parts, in this way doing much damage to the oyster-beds of the southern coast o
. Zoology : for students and general readers . Zoology. 113 ZOOLOGY. suckers, excepting those at the end of the arms, which are tentacle-like. We have already described the common star- fish of our north-eastern coast, Asterias vulgaris Stimpson (Fig. 74). This and the allied varieties are abundant on mussel and oyster beds, being very injurious to the latter, which serve them as food. The star-fish projects its capa- cious stomach, turning it inside out, between the open valves of the oyster, and sucks in the soft parts, in this way doing much damage to the oyster-beds of the southern coast of New Fig. 74.—Astmaa vulgaris, natural size.—After A. Agassiz. The bodies of star-fishes as well as sea-urchins (Echini) are covered witli pedicenaria, which in the former are situ- ated around the base of the spines on the upper side of the body. They are pincer-like, consisting of but two prongs. In the sea-urchins they are three-pronged, and scattered ir- regularly over the surface of the body. Their use is not really known. The development of this species (and its ally or variety, A. lerylinus) has been studied by A. Agassiz. After pass-. 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. New York : Henry Holt
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
