. Fresh-water biology. Freshwater biology. 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
. Fresh-water biology. Freshwater biology. 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 ^ W" '"43 '4'7" The eggs appear to be deposited be- fore segmentation begins. Specimens with one, and those with two, ovaries, appear to be about equally numerous; as no other difference has been detected, they are included for the present under the same name and description. Habitat: Maple River, Michigan. Fig. 791. Microlaimus fluviatilis. I, lateral view of female; II, head of the same. a, mouth opening; b, one of the six cephalic papillae; c, one of the four cephalic setae; d, one of the small pharyngeal teeth; e, excretory pore; /, spiral amphid; g, esophagus; k, nerve-ring; i, cardiac bulb; j, preliminary portion of the in- testine; k, renette cell; /, body cavity; m. lumen of intestine; n, one o
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
