. Comparative anatomy and physiology. Chap. III.] ECHINODERMS. 61 tube-feet were placed as the u walks" or ambulacra, and we may, therefore, speak of the ossicles or plates which specially support and protect the tube-feet as the ambulacral plates or ossicles. Accom- panying the radial water-vessel is a nerve-trunk and. i*. 23.—Diagram of a Cross-section of an Avin of a Common Starfish (wisterias rubens). On the left side the section is suppled to pass between two of the ambulacra! ossicles, but on the right side through one of them (no); ag, ambulacra! groove ;n, radial nerve; 6, radial
. Comparative anatomy and physiology. Chap. III.] ECHINODERMS. 61 tube-feet were placed as the u walks" or ambulacra, and we may, therefore, speak of the ossicles or plates which specially support and protect the tube-feet as the ambulacral plates or ossicles. Accom- panying the radial water-vessel is a nerve-trunk and. i*. 23.—Diagram of a Cross-section of an Avin of a Common Starfish (wisterias rubens). On the left side the section is suppled to pass between two of the ambulacra! ossicles, but on the right side through one of them (no); ag, ambulacra! groove ;n, radial nerve; 6, radial blood-vessel ; , radial water-vessel; a, anjpullaa ; t, tentacles or suckers; ap, adambulacral plates ; sp, spines : par, paxillrs, arising from limestone plates; or, ovary; gp, genital pore; gr, genital blood-vessel; br, respiratory processes ; pc, ca?ca of the intestine. (After P. H. Carpenter.» a blood-vessel; while in the arm of the starfish we find also generative sacs, and processes of the digestive tract; all of which enter, like the water-system, into the cavity of the disc. If, therefore, we make a transverse section (Fig. 23) throughout the arm of a starfish at a short distance from the disc we should cut through digestive, circulatory, ambulatory, generative and nervous. 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 Bell, F. J. (Francis Jeffrey), 1855-1924. London, Cassell
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