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Image from page 781 of “The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy” (1849)
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Identifier: animalkingdomar00cuvi
Title: The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy
Year: 1849 (1840s)
Authors: Cuvier, Georges, baron, 1769-1832 Metcalf Collection (North Carolina State University) NCRS Blyth, Edward, 1810-1873 Mudie, Robert, 1777-1842 Johnston, George, 1797-1855 Westwood, J. O. (John Obadiah), 1805-1893 Carpenter, William Benjamin, 1813-1885
Subjects: Animals
Publisher: London : Wm. S. Orr and Co., Amen Corner, Paternoster Row
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries
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Text Appearing Before Image:
its body is fringed {Fig. 7, a) ; at one ex-tremity of the body is a minute depression, by which it afterwards becomes attached. After about three days,the embryo attaches itself to some fixed object(as at 6) ; the form of the body begins to changefrom the cylindrical to the club-shaped (c, d) ;and the cilia of its surface disappear. The upperend is now flattened ; the position of the mouthis marked out by a depression in its centre,which is surrounded by an elevated margin; andfour indistinct tubercles, the rudiments of ten-tacula, are seen around it, (This is shown at e,which represents an individual in the conditionof d, but seen from above.) The tubercles gra-dually elongate into tentacula ; a true mouth isseen in the centre, and tentacula spring up be-tween the preceding ; and the body graduallyassumes the form of the Hydra. These changesare represented in Figs. /, g, h, i, ;, and k ; Fig.y» being a view taken from above of the animalthe stage /; and Fig. k being a corresponding
Text Appearing After Image:
Fio. 7.—Dev OFMkDIia; a, h,e,tpolypiiid growth. view of the stage j. Now in this condition, the animal is in every essential particular, a true Polype; and hasbeen repeatedly so described. It remains attached by its base to one spot, draws its food into its mouth bymeans of its arms, and these contract when the stomach is distended, and cannot then be irritated to movement.Not only docs it live as a Polype, but it also reproduces itself as a polype ; for polype-buds are not unfrequentlyseen to issue from its sides (Fig. 7,1); these become detached and form new individuals, just as in the Hydra. Thusfrom a single individual, a whole colony may be produced ; and these may all continue in the polypoid conditionfor many months, or even years. But under some peculiar circumstances, whose nature has not yet been deter-mined, an entirely new series of changes at last takes place. The body assumes a more elongated cylindrical form RADIATA. 697
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