Elementary text-book of zoology, general part and special part: protozoa to insecta . elementarytextbo00clau Year: 1892 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 Flo. 21S.—Longitudinal section through th
Elementary text-book of zoology, general part and special part: protozoa to insecta . elementarytextbo00clau Year: 1892 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 Flo. 21S.—Longitudinal section through the arm azid disc of SoUster endeca (somewhat altered after G. O. ). 0, mouth leading into the vride stomach; A, anus ; L, radia- hepatic diverticulum of the stomach ; O, genital organs ; Md, madreporic plate; Ji, inter- radial diverticulum of the rectimi; Af, ambulacral feet Ilolothurians. In some cases they are confined to the oral surface^ as in all the Asteroidea. We are able therefore to distinguish an ambulaci-al and an antambulaci'al 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
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