Echinoderms of Connecticut (1912) Echinoderms of Connecticut echinodermsofcon00coew Year: 1912 No. 19.] ECHINODERMS OF CONNECTICUT. an important function in the collection and discharge of the waste products of the body. FIG. 2. Diagram of water-vascular system of starfish; m, madre- poric plate; s. c, stone canal; T, Tiedemann's body; o. i, oral tentacle; t. f, tube-foot; amp, ampulla; r. c, radical canal; c. c, connecting canal; r, ring canal. Circulatory System. — A complex system of vessels running parallel with the vessels of the water-vascular system is termed the perihsemal syst
Echinoderms of Connecticut (1912) Echinoderms of Connecticut echinodermsofcon00coew Year: 1912 No. 19.] ECHINODERMS OF CONNECTICUT. an important function in the collection and discharge of the waste products of the body. FIG. 2. Diagram of water-vascular system of starfish; m, madre- poric plate; s. c, stone canal; T, Tiedemann's body; o. i, oral tentacle; t. f, tube-foot; amp, ampulla; r. c, radical canal; c. c, connecting canal; r, ring canal. Circulatory System. — A complex system of vessels running parallel with the vessels of the water-vascular system is termed the perihsemal system. The principal vessels of this system are divided into two parallel chambers by a vertical septum. In the septum is a smaller central canal which contains a small amount of fluid, and is thought to constitute the true blood system. This latter has therefore radial and circular canals, parallel both to the water-vascular and to the perihsemal system. The radial vessels are shown in section in Fig. i. Nervous System. - - The nervous system consists of a nerve ring surrounding the mouth, with a large radial nerve extending outward along the roof of the ambulacral groove of each arm and terminating in an orange-colored eye-spot at the tip of the arm. From the radial nerves minute branches are given off to each tube-foot and ampulla, to the superficial integument,
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