. Outlines of zoology. Zoology. 204 SEGMENTED WORMS OR ANNELIDA: partly muscular, partitions or mesenteries which moor the gullet; in the tail region there are many such; the median part of the gut swings freely. Posteriorly there are also obhque partitions which divide the segments into a median and two lateral chambers. The Vasnihir System. The blood has a bright red colour. It flows forward in a dorsal vessel, running along the mid-dorsal line of the. Fig. I -Dissection of anterior region of Arenicola. (After CosMOVici.) ?;/.2., 7«.3. Second and third mesenteric septa ; «., ventral ner\&quo
. Outlines of zoology. Zoology. 204 SEGMENTED WORMS OR ANNELIDA: partly muscular, partitions or mesenteries which moor the gullet; in the tail region there are many such; the median part of the gut swings freely. Posteriorly there are also obhque partitions which divide the segments into a median and two lateral chambers. The Vasnihir System. The blood has a bright red colour. It flows forward in a dorsal vessel, running along the mid-dorsal line of the. Fig. I -Dissection of anterior region of Arenicola. (After CosMOVici.) ?;/.2., 7«.3. Second and third mesenteric septa ; «., ventral ner\"e- cord ; , bristle sac ; , ventral vessel; , sixth nephridium ; i., intestine; , lateral vessel; '., dorsal vessel; h., heart: £:L, one of the two larger ccsophageal ; a'., irsopliagus. gut, backward in a ventral vessel below the gut. Two sub-intestinal vessels lie between the ventral vessel and the gut, and receive tributaries from the anterior gills. (Some deny that the sub-intestinal vessel is double.) On each side of the digestive part of the gut there is a lateral vessel. Just behind the posterior pair of cesophageal glands lies a very contractile heart. It consists of two lateral chambers. 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 Thomson, J. Arthur (John Arthur), 1861-1933; Newbigin, Marion I. (Marion Isabel), 1869-1934; Smith, Preserved, 1880-1941. fmo. New York, D. Appleton & Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
