. Fresh-water biology. Freshwater biology. &. ; 15. â ^: â " â Lateral wings {3) are very prominent, and pos- teriorly are somewhat scalariform. The females have symmetrically reflexed ovaries. Habitat: Fresh-water ponds. Cape Breton Is- land, Dominion of Canada. Fig. 786. Spilophora canadensis. a, mouth opening; b, dorsal tooth; c, pharynx; d^ base of the pharynx; e, esophagus; /, nerve cells; g, nerve-ring; h, excretory pore; i, valvular apparatus of the bulb; j, longitudinal row of cuticular markings characteristic of the genus; A, intestine; /, renette cell; m, nucle
. Fresh-water biology. Freshwater biology. &. ; 15. â ^: â " â Lateral wings {3) are very prominent, and pos- teriorly are somewhat scalariform. The females have symmetrically reflexed ovaries. Habitat: Fresh-water ponds. Cape Breton Is- land, Dominion of Canada. Fig. 786. Spilophora canadensis. a, mouth opening; b, dorsal tooth; c, pharynx; d^ base of the pharynx; e, esophagus; /, nerve cells; g, nerve-ring; h, excretory pore; i, valvular apparatus of the bulb; j, longitudinal row of cuticular markings characteristic of the genus; A, intestine; /, renette cell; m, nucleus of renette cell; «, cell accessory to the renette cell; 0, blind end of testicle; p, reversal of the striationsof thecuticula; 0, vas deferens; ; s, anus; /, caudal gland; u, spinneret. (After 27 (26) Striae composed of dots; the lateral ones little if any accentuated. 28 28 (29) Pharynx without esophageal bulb Cyatholaimus Bastian. Pharynx is cup shaped then conoid, and longitudinally ribbed. Genus of a score or more of aquatic species, nearly all marine but found also in brackish and fresh waters. Cyatho- laimi are found in all tropical and tem- perate seas, and the individuals are nu- merous. In most habitats both sexes will be found. Diatoms are sometimes found in the intestine. Though not shown in the species here figured, the re- nette seems always present, and is often well developed. Representative species. Cyatholaimus truncatus Cobb "19 -I. 2 3 r\2 6 Habitat: Silver Springs, Fla. Fig. 787. Cyatholaimus truncatus. I, side view of a female; II, side view of head; III, front view of the same head; IV, ventral view of anal region of male; y, lateral view of the same; VI, lateral view in the middle of the body showing cuticular markings and pores. o, submedian cephalic seta; b, labial papilla; c, amphid; i, dorsal tooth; e, lat- eral cephalic seta; /, one of the twelve ribs of the vestibule; g, small submedian pharyn- geal tooth; h, ba
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
