. Fresh-water biology. Freshwater biology. PARASITIC ROUNDWORMS 525 24 (23) Only two small conical papillae near mouth. Filaria physalura Bremser 1811. Living worm pink with brown intestine and white uteri prominent. Female 30 to 45 cm. long, I to mm. broad. Head obtuse. Mouth with two small conical papillae. Male 35 mm. long, mm. broad; tail curved with short quinquecostate alae which are mm. long. Spicule recurved. In abdomen of kingfisher; Pennsylvania. "Determination not positive" (Leidy). 25 (20) Anterior end provided with two lips. Each lip carries two blunt hook
. Fresh-water biology. Freshwater biology. PARASITIC ROUNDWORMS 525 24 (23) Only two small conical papillae near mouth. Filaria physalura Bremser 1811. Living worm pink with brown intestine and white uteri prominent. Female 30 to 45 cm. long, I to mm. broad. Head obtuse. Mouth with two small conical papillae. Male 35 mm. long, mm. broad; tail curved with short quinquecostate alae which are mm. long. Spicule recurved. In abdomen of kingfisher; Pennsylvania. "Determination not positive" (Leidy). 25 (20) Anterior end provided with two lips. Each lip carries two blunt hooks. Filaria cingula von Linstow 1902. Length 13 to 25 cm., diameter mm. Anterior end bluntly rounded; dorsal and ventral, triangular lips with two blunt hooks in each. Cuticula embossed with low, rounded trans- verse ridges on dorsal and ventral surfaces. Pharynx narrow, mm. long, with bulbous enlargement at end. Esophagus triangular, 15 by mm. Lateral fields broad. Two ovaries. Vulva? Embryos by mm. Viviparous. In skin of Crypiobranchus allegheniensis; Ohio river. Identification with von I-instow'B meager description Fig. 818. Filaria cingula. Optical section of the two anterior millimeters; I, lips; p, pharyngeal bulb; 0, ovary; e, esophagus; «, uterus; h, hooks; r, ridges. Magnified about so. (After Krecker.) 26 (17) Esophagus with two separate regions, more or less differentiated. Superfamily Spirxjroidea Railliet and Henry 1915 . 27 The mouth has two lips, or is without any. Esophagus with partition dividing it into two regions which may be differentiated as anterior muscular and posterior granular region, and may be much alike in appearance. Male with lateral alae near posterior end of body. Alae in general long, not much if any wider than body, without ribs or radiate, branching supports. Most of these forms were previously included with the Filarioidea from which they are most easily distinguished by the double esophagus. 27 (42) A
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
