. A manual of zoology. Zoology. 514 CCELHELMINTHBH. primitive forms which in structure and development (fig. 250) are of importance in the phylogenesis of the Annelids. Pohjgordius*. Fig. 284.—New England Annelids. A^ male Autolytvs ; B, Sternasjjis fossor ; C, Cis- tenides goutdii; £), Clyniene torqitata. (From Emerton and Yerrill.) Order II. OligochEetae. The Oligochffites are almost as preeminently fresh-water and terrestrial forms as the Polychstes are marine. They are in most respects simpler than their marine relatives, apparently the result of degeneration, which has followed from tlie
. A manual of zoology. Zoology. 514 CCELHELMINTHBH. primitive forms which in structure and development (fig. 250) are of importance in the phylogenesis of the Annelids. Pohjgordius*. Fig. 284.—New England Annelids. A^ male Autolytvs ; B, Sternasjjis fossor ; C, Cis- tenides goutdii; £), Clyniene torqitata. (From Emerton and Yerrill.) Order II. OligochEetae. The Oligochffites are almost as preeminently fresh-water and terrestrial forms as the Polychstes are marine. They are in most respects simpler than their marine relatives, apparently the result of degeneration, which has followed from tlie more simple conditions of existence. Byes are rudimentary or lacking, they have no palpi, cirri, or tentacles; gills are rare, but most striking is the absence of parapodia, the bristles projecting directly from the body wall (fig. 280). The cha=t;« may be regularly distributed around each somite (PericJupfa) or gathered on the sides (Jfec/as- colex) or arranged in four bunches so tiiat in the animal four longitudinal rows occur. 1'he animals are liermaphroditic, testes and ovaries lying in different somites. Usually the integument in the neighborhood of the sexual openings is thickened by 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. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
