. Comparative anatomy and physiology. 538 COMPARATIVE ANATOMY AND PHYSIOLOGY. connection between the peritoneal vesicle and the outer world is permanently retained, and forms the so-called madreporic canal. A few Echinoderms (Hemiaster, Ophiacantha vivipara, Chirodota rotifera) do not pass through any. Fig 223.— Pluteus paradoxes, the Larva of an Ophiuroid, at a late stage, in which both the Larval Arms with their supports and the rudi- ments of the Disc and Radial Skeleton of Adult are to be seen. (After J. Muller.) larval stages; the eggs are received into incubatory pouches, or are develope
. Comparative anatomy and physiology. 538 COMPARATIVE ANATOMY AND PHYSIOLOGY. connection between the peritoneal vesicle and the outer world is permanently retained, and forms the so-called madreporic canal. A few Echinoderms (Hemiaster, Ophiacantha vivipara, Chirodota rotifera) do not pass through any. Fig 223.— Pluteus paradoxes, the Larva of an Ophiuroid, at a late stage, in which both the Larval Arms with their supports and the rudi- ments of the Disc and Radial Skeleton of Adult are to be seen. (After J. Muller.) larval stages; the eggs are received into incubatory pouches, or are developed in the ccelom without pass- ing through any larval stages, or leading a free- swimming independent existence. A very common form of free-swimming larva is that which is known as the Trocliospliere, and which essentially resembles the adult condition of a Rotifer; it is found among the marine Chsetopoda, some of the Gephyrea and Mollusca, and in the. 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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