Society, P: Palaeontographical Society, 1863, Vol. 15

Anglický jazyk

Society, P: Palaeontographical Society, 1863, Vol. 15

Vydavateľstvo: Forgotten Books
Formát: Paperback
Jazyk: Anglický jazyk
ISBN: 9780243216208

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O knihe

Excerpt from Palaeontographical Society, 1863, Vol. 15: British Fossil Echinodermata From the Oolitic Formations, Volume Second, Part First, on the Asteroidea; Supplementary Monograph on the Mollusca From the Stonesfield Slate, Great Oolite, Forest Marble, and Cornbrash

The true star-fishes forming the order asteroidea have in general a depressed stelliform body,,which sometimes assumes a polygonal or pentagonal figure. From the central disc five or more hollow rays proceed, containing prolongations of the internal organs (pl. I, fig. The entire upper surface is covered with a coriaceous integument, in which a series of calcareous pieces, often supporting spines, tubercles, and pedicellariae, are developed (fig. 2, a). In the centre of the under surface is the mouth-opening, from whence radiate to the extremities of the rays as many ambulacra as there are lobes; in these, the tubular retractile feet are arranged in two or four rows; and the margins of the rays in many genera are bordered by well-developed spinigerous plates. (pl. I, fig. 2.

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