. Fresh-water biology. Freshwater biology. 498 FRESH-WATER BIOLOGY 54 (53) Male supplementary organs protusile tubes. Aphanolaimus de Man. Genus of fresh-water nematodes, of which nearly a dozen species are known. Hermaphroditism occurs. Representative species. Aphanolaimus spiriferus Cobb â¢5ff« â ' 55 (52) Viviparous. Two embryos and de- veloping egg have been seen in each uterus at the same time. Eggs, about as long as body is wide, and less than half as wide as long. Habitat: Potomac River, Wash- ington, D. C. Fig. 801. Aphanolaimus spiriferus. I, lateral view, anterior end of f
. Fresh-water biology. Freshwater biology. 498 FRESH-WATER BIOLOGY 54 (53) Male supplementary organs protusile tubes. Aphanolaimus de Man. Genus of fresh-water nematodes, of which nearly a dozen species are known. Hermaphroditism occurs. Representative species. Aphanolaimus spiriferus Cobb â¢5ff« â ' 55 (52) Viviparous. Two embryos and de- veloping egg have been seen in each uterus at the same time. Eggs, about as long as body is wide, and less than half as wide as long. Habitat: Potomac River, Wash- ington, D. C. Fig. 801. Aphanolaimus spiriferus. I, lateral view, anterior end of female; II, lateral view, posterior end of female; III, lateral view of head, more highly magnified; IV, male supplementary organ; V, lateral view of posterior ex- tremity of male. a, mouth opening; b, amphid; c, lumen of esophagus; d, pigmented eye-spots (?); e, intestine; /, nerve cell; g, rectum; A, nerve-ring; *, anus; k, esophagus; /, cau- dal gland; m, duct of caudal gland; n. glandular body at base of neck; 0, spin- neret: pf ejaculatory duct; g, intestine: r, anterior end of cloaca: s, right spiculuro; t, backward pointing accessoiy piece; «, nerve cells (?); v, male supplementary organs. (After Cobb.) Amphids circular or ellipsoidal Tripyla Bastian. Genus of toward twenty fresh-water species, some at least carnivorous. Representative species. Tripyla lata Cobb 1914. ir 3 1 is i.^ }.2 ' 2*â¢Â»-' J,. 2 '.: ». -M-" M 8 â ,. P"!! 3:5 r? Ts SVJT^ ^''â¢Â°-- In lumen of pharynx at a point re- moved from anterior extremity a distance a little greater than radius of head, minute inward-pointing dorsal tooth, having a length about equal to width of one of the annules of cuticula, proving that pharynx extends backward a dis- tance equal to width of head. In some specimens not far behind this point dis- tinct transverse fold in lining of esopha- gus. Habitat: Alpine Lakes, Bald Mountain, Colorado. Fig. 8c2. Tripyla lata, a, labial papilla: b, lip;
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
