. Fresh-water biology. Freshwater biology. 404 FRESH-WATER BIOLOGY I3S (132) Genital pore near acetabulum 136 136 (137) No conspicuous pharyngeal glands. Plagiorchis Liihe Body elongate oval, somewhat attenuated at both ends, covered with minute spines. Pharynx and esophagus of approximately equal length, crura reach posterior end, or near it. Genital pore just an- terior to acetabulum, median or slightly sinistral. Cirrus sac curved around and reaching posterior margin of acetabulum, with large vesicula seminalis. Testes round to oval, obUque, separated by uterine branches. No receptac
. Fresh-water biology. Freshwater biology. 404 FRESH-WATER BIOLOGY I3S (132) Genital pore near acetabulum 136 136 (137) No conspicuous pharyngeal glands. Plagiorchis Liihe Body elongate oval, somewhat attenuated at both ends, covered with minute spines. Pharynx and esophagus of approximately equal length, crura reach posterior end, or near it. Genital pore just an- terior to acetabulum, median or slightly sinistral. Cirrus sac curved around and reaching posterior margin of acetabulum, with large vesicula seminalis. Testes round to oval, obUque, separated by uterine branches. No receptaculum seminis. Ovary spherical, at inner end of cirrus sac. Vitellaria with many closely crowded foUi- cles usually reaching posterior end. Uterine coils partly pretesticu- lar, chiefly posttesticular. Eggs numerous. In intestine of insectivorous vertebrates, chiefly birds, but also amphibians, reptiles and mammals, infection probably through in- sects. Little speciaMzed forms that constitute the type of the family and from Which other genera have diverged in several directions. North American species. Plagiorchis proximus Barker 1915. Reported from the muskrat in North America. Fig. 701. Plagiorchis proximus. Ventral view. X 2S- (After Barker.) 137 (136) Conspicuous pharyngeal glands present. Glypthdmins Stafford 1905. Small, oval distomes with rounded ends and cylindrical body. Skin spinous. Acetabulum smaller than oral sucker, anterior to middle of body. Pharynx and esophagus present, pharyngeal glands conspicuous; crura nearly reach posterior end. Testes small, spherical, at center of body, post- acetabular, nearly symmetrical. Genital pore median between acetabulum and fork of intestine. Cirrus sac overlaps acetabulum in part. Ovary small at left of acetabulum, receptaculum seminis present. Uterus with numerous short transverse coils within crura between testes and posterior end, spread- ing somewhat beyond ends of intestine. Vitellaria lateral from fork of in- testine near
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
