. A manual of elementary zoology . Zoology. 224 MANUAL OF ELEMENTARY ZOOLOGY nephrostome consists of a large crescentic central cell with a rim of marginal cells around it arranged so as to surround a crescentic, funnel-shaped opening, turned to one side. The funnel is ciliated, and from it there leads backwards a narrow ciliated tube. This passes through the septum to the main part of the nephridium, which lies behind the. deb. B Fig. 141.—The nephrostome or funnel of a nephridium of the earth- worm. A, in surface view, highly magnified; B, in longitudinal section, diagrammatic. , Ce
. A manual of elementary zoology . Zoology. 224 MANUAL OF ELEMENTARY ZOOLOGY nephrostome consists of a large crescentic central cell with a rim of marginal cells around it arranged so as to surround a crescentic, funnel-shaped opening, turned to one side. The funnel is ciliated, and from it there leads backwards a narrow ciliated tube. This passes through the septum to the main part of the nephridium, which lies behind the. deb. B Fig. 141.—The nephrostome or funnel of a nephridium of the earth- worm. A, in surface view, highly magnified; B, in longitudinal section, diagrammatic. , Central cell; deb., ddbris of coelomic corpuscles and excretory granules being swept into the funnel; ?».£., marginal cells; />.*., peritoneal epithelium; />.£., vesicular connective tissue cells; jr., point at which the marginal cells join the lining of the tube, which turns over round the opening. septum, in the ccelom of the next segment, opening to the exterior by the nephridiopore in that segment. The narrow part of the tube is long and winding and loses its cilia in places. It is followed by a wider, short, brown region, ciliated throughout, this by a still wider tube which is not ciliated, and finally a short, very wide, muscular tube leads to the nephridiopore. The whole tube, except the muscular region, is formed of hollow cells shaped like drain pipes. 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 Borradaile, L. A. (Lancelot Alexander), 1872-1945. London : H. Frowde, Hodder & Stoughton
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
