. Contributions to the natural history of the United States of America. Zoology; Chelonia (Genus); Ctenophora; Cnidaria; Animals. b 2 â « I, EscorE MlCBBLlNl, Ag. A, B, C, D, E, the interambulacral zones. âI, II, III, IV, V, the am- bulacral zones. â a, 6 and 1, 2, the respective halves of these systems. This being once understood, there can be no difficulty in homologizing the sys- tems of radiating tubes of the Acalephs with those of the Echinoderms, as represented from the abactinal surface in Encope Michelini, Fig. 4. Upon removing tlie outer layer of the solid enveloj^e of this Sea- urch
. Contributions to the natural history of the United States of America. Zoology; Chelonia (Genus); Ctenophora; Cnidaria; Animals. b 2 â « I, EscorE MlCBBLlNl, Ag. A, B, C, D, E, the interambulacral zones. âI, II, III, IV, V, the am- bulacral zones. â a, 6 and 1, 2, the respective halves of these systems. This being once understood, there can be no difficulty in homologizing the sys- tems of radiating tubes of the Acalephs with those of the Echinoderms, as represented from the abactinal surface in Encope Michelini, Fig. 4. Upon removing tlie outer layer of the solid enveloj^e of this Sea- urchin, there appear, in the interambulacral zones, five sys- tems of tubes (A, B, C, D, and E), radiating towards the peri- phery, and there anastomosing with a circular marginal tube, no mention of which has thus far been made by any anato- mist. These tubes are as nu- merous and as complicated, and anastomose as freely with one another, as the radiating tubes of any Acaleph; they occujoy, as in the Acalephs, the same structural zone as the sexual organs, and are closely connected with them, as I shall show on another occasion. With these alternate the five ambulacral zones (I, II, III, IV, and V), the tubes of which anastomose, near the periphery, with those of the inter- ambulacral zones, as may be seen on every point of the circumference, where the tubes a and I of their respective ambulacra I, II, III, IV, and V, unite with the tubes 1 and 2 of their respect- ive interambulacra A, B, C, D, and E. And these two sets of tubes correspond equally to the two sets already described in Aurelia flavidula; the ambulacral tubes I a b, II b a, III a b, and lY b a of Fig. 5, corresponding to the ambulacral. J' m a- Adrelu FUviBDLi, Per. ^ I, n, III, IV, the ambula'ral zones.â A. B, C, D, the interambulacral zones. â a. b and I, 2, 3, 4, the respective halves of these systems. tubes I « J, II b a, III a b, YV a b, and V i « of Encope Michelini, Fig. 4, and the interambu
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