. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. THE STAEFISH 251 Systematic Position. — The starfishes belong to the group of Echinodermata/ as is proved by their five-rayed structure; the well-developed system of limy plates in the skin; a system of water-tubes, used for loco- motion ; and the separation of the intestine from the body-cavity. Distribution and Habitat. — The common pirLk star- fish of the eastern United States (Asterias ^ vulgaris ^) ranges from Labrador to northern Florida.^ It hves near the shore, extending out into fairly deep water,
. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. THE STAEFISH 251 Systematic Position. — The starfishes belong to the group of Echinodermata/ as is proved by their five-rayed structure; the well-developed system of limy plates in the skin; a system of water-tubes, used for loco- motion ; and the separation of the intestine from the body-cavity. Distribution and Habitat. — The common pirLk star- fish of the eastern United States (Asterias ^ vulgaris ^) ranges from Labrador to northern Florida.^ It hves near the shore, extending out into fairly deep water, but is not abundant at greater depths than sixty fathoms. It is found especialljr on the oyster-beds, where it is very destruc- tive. On rocky coasts starfishes will be found in crevices of the rock or in tide-pools. They love cool waters, and are often found hanging on vertical walls or ledges. Upon reaching the surface of quiet water, they may extend one or more of their arms out upon the under side of the surface film and seem to hang in part from it. Abnormalities are frequently found among starfishes, — partly on account of their capacity for regeneration, even from. Fig. 241. —Abnormal starfish (Asteriaa), apparently produced by fusion of two rays. One-half nat. size. Photo, by W. H. C. P. ' echinos, hedgehog, sea-urchin f derma, skin. ' From aster, star. 3 Common. ^ A dark brown form, sometimes called Asterias Forhesn, is recognized by some authors as a separate species inhabiting the coast from Massachusetts Bay 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 Davenport, Charles Benedict, 1866-1944; Davenport, Gertrude Anna Crotty, 1866- joint author. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1911
