. Fresh-water biology. Freshwater biology. FREE-LIVING NEMATODES 491 34 (31) Pharynx cyathiform then prismoid, ending behind very definitely; amphids distinct. Ethmolaimus de Man. Genus of two known species, one European, one American. Closely related to Chromadora, from which it is readily distinguished by the narrow uniform posterior portion of the pharynx, which is usually surrounded by a comparatively distinct pharyngeal bulb. Representative species. Ethmolaimus americanus Cobb 1914. <â â 2 5 10. IS 'S4'" . ,. Labial papillae, apparently 12. Onchus thumb- shaped, forward point
. Fresh-water biology. Freshwater biology. FREE-LIVING NEMATODES 491 34 (31) Pharynx cyathiform then prismoid, ending behind very definitely; amphids distinct. Ethmolaimus de Man. Genus of two known species, one European, one American. Closely related to Chromadora, from which it is readily distinguished by the narrow uniform posterior portion of the pharynx, which is usually surrounded by a comparatively distinct pharyngeal bulb. Representative species. Ethmolaimus americanus Cobb 1914. <â â 2 5 10. IS 'S4'" . ,. Labial papillae, apparently 12. Onchus thumb- shaped, forward pointing, attached to a distinctly thickened rib of cuticula which extends from the lip region back to the base of the pharynx, and is thicker anteriorly than posteriorly. Fully developed ova are nearly twice as long as the body is wide, and one-third as wide as long. Form, size, and number of eggs un- known. Habitat: Spring, Washington Country Club, Chevy Chase, Md. Fig. 790. Ethmolaimus americanus. Lateral view of a female, a, lips; b, minute dorsal and ventral pharyngeal teeth; c, one of the four cephalic setae; d, amphid; e, pharynx; /, nerve-ring; g, excretory pore; h, nerve cells; i, cardiac bull); j, beginning of the intestine; k, renette cell C?); I, beginning of main portion of the intestine; m, one of two pairs of unicellular organs of unknown significance; n, cuticula; o, one of the cells of the intestine; p, subcuticula; q and r, body cavity; s, vulva; i, nucleus of one of the muscle cells; m, spinneret; v, one of the caudal glands; 35 (30) Dorsal tooth minute, amphids circular. . Microlaimus de Man. Amphids well developed. Genus of few species from Europe and North America. Representative species. Microlaimus fluviatilis Cobb 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 Ward, Henry Baldwi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
