. A manual of zoology. Zoology. ::70 CCELHELMIXTIIES closely related that they must he incliuled under the common head; the missinLT characters have heen lost durim: e\' Fig. ^51.âDiagram of annelid somites (oris;.), am. acicular muscles; c, ccelom; cm, circular muscles; cv, circular blood-vessels; </, dorsal blood-vessel; ?', intestine; Im, longitudinal muscles; m. mesentery; «, nerve cord; iia, nephridium; nc, no, neuro- and notopodia, forming parapodium; 5, septum; so, somatopleure; sp, splanchnopleure; t, lyphiosole. Sub Class I. Chcctopoda. These, like the Nematoda, are cylin
. A manual of zoology. Zoology. ::70 CCELHELMIXTIIES closely related that they must he incliuled under the common head; the missinLT characters have heen lost durim: e\' Fig. ^51.âDiagram of annelid somites (oris;.), am. acicular muscles; c, ccelom; cm, circular muscles; cv, circular blood-vessels; </, dorsal blood-vessel; ?', intestine; Im, longitudinal muscles; m. mesentery; «, nerve cord; iia, nephridium; nc, no, neuro- and notopodia, forming parapodium; 5, septum; so, somatopleure; sp, splanchnopleure; t, lyphiosole. Sub Class I. Chcctopoda. These, like the Nematoda, are cylindrical worms, but are at once distinguished by the segmentation. Deep circular constrictions (fig. 2^2) bound the somites externally. Inter- nally the ccelom is divided by the septaâdelicate double membranes which extend from the ectoderm to the alimentary canalâiiito as many chambers as there are metameres, while a longitudinal mesentery, also doulile, separates the ccrlomic pouches of the right side from those of the left (ligs. 251, 253). The alimentary canal has a terminal anus, while the mouth is ventral and is overhung by the preoral segment, the prostomium. Fig. 2S2.âFarthworm, side \'ic\\' xt ^ i 1 j t j A , â 11 1 f, T A'ervous system, blood-vessels, and and anterior end enlarged (.alter \ ogt â ' and Jung). i, first .segment «ith excretory organs are inlluenced by the mouth and prostomium; 15, male segmentation. The nervous system openmg; 33-37, clitelluni. '^ is on the ladder plan (p. 113). It begins with a supraocsophageal ganglion ('brain') in the prostomium, from wliich the esophageal commissures pass around the oesophagus. 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
