. Elementary text-book of zoology. Zoology. FIG. 217.—Sea-urchin 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 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. PIG. 218.—Longitudinal section through the arm and disc of Solust-er endeca (somewhat altered after G. O. Sars). 0, mouth
. Elementary text-book of zoology. Zoology. FIG. 217.—Sea-urchin 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 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. PIG. 218.—Longitudinal section through the arm and disc of Solust-er endeca (somewhat altered after G. O. Sars). 0, mouth leading into the wide stomach ; A, anus ; L, radia- hepatic diverticulum of the stomach ; (?, genital organs ; Md, madreporic plate; Js, inter- radial diverticulum of the rectum ; Af, ambulacral feet Holothurians. In some cases they are confined to the oral surface, as in all the Asteroidea. We are able therefore to distinguish an ambulacra! and an antambulacral zone—the first coinciding with the oral and ventral surfaces, the latter with the dorsal surface. Never- theless the ambulacral feet are variously constructed, and do not in. 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. New York : Macmillan
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
