. Fresh-water biology. Freshwater biology. PARASITIC ROUNDWORMS 523 14 (9) Male with bell-shaped bursa encircling posterior end; no supporting ribs in bursa. No buccal capsule. Family Dioctophymidae Railliet 1915. Mouth surrounded by one or two circles of papillae, 5, 12, or 18 in number. Esophagus very long, without bulb. One ovary; vagina very long. Vulva near anterior end; anus terminal in female. One long spicule. Eggs with very'lhick pitted shells. Large worms, in some genera armed with spines near anterior end. Only genus parasitic in North American aquatic hosts. Diodophyme Collet-Meygr
. Fresh-water biology. Freshwater biology. PARASITIC ROUNDWORMS 523 14 (9) Male with bell-shaped bursa encircling posterior end; no supporting ribs in bursa. No buccal capsule. Family Dioctophymidae Railliet 1915. Mouth surrounded by one or two circles of papillae, 5, 12, or 18 in number. Esophagus very long, without bulb. One ovary; vagina very long. Vulva near anterior end; anus terminal in female. One long spicule. Eggs with very'lhick pitted shells. Large worms, in some genera armed with spines near anterior end. Only genus parasitic in North American aquatic hosts. Diodophyme Collet-Meygret 1802. Anterior end unarmed; mouth surrounded by six papillae. Only species known Dioctophyme renale (Goeze) 1782, Color blood red; six circumoral papillae and 150 along lateral lines. Male up to 40 cm. long, 4 to G mm. broad. Anus terminal, surrounded by circular bursa without ribs. Spicule s to 6 mm. long. Female up to I m. long, and 12 mm. broad. Anus crescentic, terminal. Sex pore only so to 70 mm. from anterior tip. Uterus single. Eggs oval; shell brown, very thick, deeply pitted except at poles. In pelvis of kidney of seal, otter, dog, wolf, etc. Rare in man. Reported from mink and dog in Pennsylvania by Leidy. Found in dogs at Chicago, Illinois. Intermediate host probably a fish. The giant among nematodes; a dangerous and little-known parasite. Another form which may belong here was collected in Florida by Wyman from the water-turkey or snake-bird and described as "nearly if not identical with Eustrongylus papillosus Diesing in Plotus anhinga ?' ?â . ^?''«''*"y'»f from ; The species last mentioned was included in the genus fSe X 3 (Ster Mct Hystrichis by Molin, but as the identification of Wyman was not final and Chandler.) i' '^ impossible to enter Hystrichis papillosus definitely among North American species. 15 (8) Bursa absent or weakly developed in male. True buccal capsule wanting . ; . . 16 Compare the discussion under 9 (14) in this
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
