. A manual of zoology. Zoology. I. ASTEROIDEA 295 form the roomy body cavity of the aduU, the membranes separating them furnish- ing the mesenteries. The right hydrocoele remains rudimentary; the left, which has the external opening, separates into (i) a smaller anterior porUon, the anlage of the anipulla and axial sinus; (2) the connecting duct or stone canal; and (3) a posterior cavity, the hydrocccle in the narrower sense. The latter surrounds the oesophagus (ring canal) and sends off five radial diverticula, the anlagen of the radial canals, which form the basis of the conversion of the bi
. A manual of zoology. Zoology. I. ASTEROIDEA 295 form the roomy body cavity of the aduU, the membranes separating them furnish- ing the mesenteries. The right hydrocoele remains rudimentary; the left, which has the external opening, separates into (i) a smaller anterior porUon, the anlage of the anipulla and axial sinus; (2) the connecting duct or stone canal; and (3) a posterior cavity, the hydrocccle in the narrower sense. The latter surrounds the oesophagus (ring canal) and sends off five radial diverticula, the anlagen of the radial canals, which form the basis of the conversion of the bilateral larva into the radially symmetrical adult (fig. 284). It is a question as to which group of Echinoderma is the most primitive, but ease of treatment makes it best to begin with 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
