. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. 274 ZCllINODEEMATA. 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 mucking discs; they then contract and draw the body slowly in tlie direction of the radii. The number and distribution of these appendages aie subject to numerous modifications. Sometimes. Fig. 217.—Sea-urcliin divided along the equatorial line (after Tiedemann) D, Digestive canal fixed to the shell by mesentery ; G, generative organs ; J, inter-radi
. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. 274 ZCllINODEEMATA. 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 mucking discs; they then contract and draw the body slowly in tlie direction of the radii. The number and distribution of these appendages aie subject to numerous modifications. Sometimes. Fig. 217.—Sea-urcliin divided along the equatorial line (after Tiedemann) D, Digestive canal fixed to the shell by mesentery ; G, generative organs ; J, inter-radial plates. they are ari'anged 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; Metcalf Collection (North Carolina State University). NCRS. London, Swan Sonnenschein
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanimals, bookyear1892
