. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. 274 ECHINODERMATA. fluid into the feet and cause them to swell, and hence to project. A number of feet so distended affix themselves by means of their sucking discs; they then contract and draw the body slowly in the direction of the radii. The number and distribution of these appendages are subject to numerous modifications. Sometimes. FIG. 217.—Hen-urchin divided along the equatorial line (after Tiedernann). D, Digestive canal fixed to the shell by mesentery ; G, generative organs ; J&quo
. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. 274 ECHINODERMATA. fluid into the feet and cause them to swell, and hence to project. A number of feet so distended affix themselves by means of their sucking discs; they then contract and draw the body slowly in the direction of the radii. The number and distribution of these appendages are subject to numerous modifications. Sometimes. FIG. 217.—Hen-urchin divided along the equatorial line (after Tiedernann). D, Digestive canal fixed to the shell by mesentery ; G, generative organs ; J", inter-radial plates. they are arranged in rows along the whole length of the meridian from the oral region to the periproct (Cidaridea and Pentacta). Sometimes they are scattered irregularly over the whole surface of the body, or only over the foot-like ventral surface, as in the. 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 Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. London, Swan Sonnenschein & co.
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Keywords: ., book, bookcentury1800, bookcollectionbiodiversity, bookdecade1890
