File:Image from page 234 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14785046145).jpg

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Identifier: introductiontozo00dave Title: Introduction to zoology; a guide to the study of animals, for the use of secondary schools; Year: 1900 (1900s) Authors: Davenport, Charles Benedict, 1866-1944 Davenport, Gertrude Anna Crotty, 1866- Subjects: Zoology Publisher: New York, Macmillan company London, Macmillian and co., ltd. Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library


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Text Appearing Before Image: ns sea-roses, and in this country and in Eng-land sea-anemones. They are of cylindrical form, beara circle of tentacles around the mouth at the upper end,and have a muscular base by which they attach themselves.They vary in diameter from one-sixth of an inch to twofeet. Some species live in the sand, out of which they getsome organic food, and at least one species (Minyass) isfree-swim m ing. Our commonest Northern sea-anemone is Metridiummarginatum (Fig. 202), which occurs on rocky shores south bladder. 2 o-Kixpos, cup ; fwoz>, animal. 3 For a figure of Mnyas, see Parker and Haswell, Text-book ofZoology, p. 189, Fig. 13U. THE HYDRA AND ITS ALLIES 215 to New Jersey, but reaches its maximum developmentalong the coast of Maine. It varies greatly in color, someindividuals being white, others salmon-colored or olive.The flat upper surface bears the slit-like opening to theinternal sac. Either one or both angles of this slit havethickened edges, and corresponding to this difference is a

Text Appearing After Image: FIG. 202.— Metridium, one of our sea-anemones. Two individuals shownexpanded. Photo, of the living animals in the water, by W. H. C. P. difference in the internal structure. Inside, the centralcavity is separated into compartments by radial partitions.The coral polyp does not differ essentially from Metri-clium. But it has the habit of secreting lime at its base,so that, in course of time, a high cup is built up. The topof the cup bears radial septa,1 which are laid down i Fig. 203. 216 ZOOLOGY in the interspaces between the fleshy partitions men-tioned in speaking of Metridium. Since most corals, like


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