. Outlines of zoology. Zoology. STRUCTURE OP ARENICOLA. 205 or ventricles, each of which receives blood from the dorsal vessel, from a sub-intestinal vessel, and from a lateral vessel, and drives blood into the ventral vessel. Each of the lateral vessels before entering the heart expands into a kind of auricle. The longitudinal vessels are all connected by transverse branches. From the ventral vessel arise afferent branchial vessels. From the seven posterior gills efferent branches enter the dorsal vessel; while those from the six anterior gills join the sub-intestinals. Each efferent vessel g
. Outlines of zoology. Zoology. STRUCTURE OP ARENICOLA. 205 or ventricles, each of which receives blood from the dorsal vessel, from a sub-intestinal vessel, and from a lateral vessel, and drives blood into the ventral vessel. Each of the lateral vessels before entering the heart expands into a kind of auricle. The longitudinal vessels are all connected by transverse branches. From the ventral vessel arise afferent branchial vessels. From the seven posterior gills efferent branches enter the dorsal vessel; while those from the six anterior gills join the sub-intestinals. Each efferent vessel gives off. Fig. 67.—Cross section of Arenicola. (After CosMOVici.) E. Epidermis; , circular muscles ; /./«., longitudinal muscles; , body cavity ; ^/., gill; ^., setae; ^ nephridial pore; a,br,, afferent branchial ; ^./r., efferent branchial; ?;., ventral nerve-cord with blood vessels above; , dorsal vessel; /.-'., lateral vessel; , sub-intestinal vessel; z'.z'., ventral vessel ; ^., gut. a branch to the skin, while the dorsal and sub-intestinal vessels give off numerous branches to the walls of the gut. It seems that the flow of the blood is not always quite the same. Respiratory System. There are thirteen pairs of gills. Each is a tuft of thread-like branches, through the thin walls of which 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 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
