. Fresh-water biology. Freshwater biology. PARASITIC FLATWORMS 383 region. Genital pore median, not far from oral sucker. Cirrus sac elongate enclosing only part of the convoluted seminal vesicle. Testes symmetrical, near posterior end, outside intestinal crura. Ovary between testes. Vitellaria lateral, anterior to testes. Uterine coils behind cirrus sac, transverse, regular, not extending outside intestinal crura. Eggs with long fila- ments at both poles. 42 (43) With conspicuous longitudinal rows of papillae on ventral surface. Metraterm barely half as long as cirrus sac. Notocotylus Biasing
. Fresh-water biology. Freshwater biology. PARASITIC FLATWORMS 383 region. Genital pore median, not far from oral sucker. Cirrus sac elongate enclosing only part of the convoluted seminal vesicle. Testes symmetrical, near posterior end, outside intestinal crura. Ovary between testes. Vitellaria lateral, anterior to testes. Uterine coils behind cirrus sac, transverse, regular, not extending outside intestinal crura. Eggs with long fila- ments at both poles. 42 (43) With conspicuous longitudinal rows of papillae on ventral surface. Metraterm barely half as long as cirrus sac. Notocotylus Biasing 1839. Body attenuated in front, broadly rounded behind. Ventral surface with three rows (in N. quinqueserialis with five rows) of glandular masses which open into protrusible grooves. European species reported from cecum of water birds. Representative American species. Notocotylus quinqueserialis Barker and Laughlin 1911. In North America one species; in the ceciun of the muskrat. Nebraska, Fig. 665. Notocotylus quinqueserialis. Ventral view. Earker and Laugblin.) Magnified. (After 43 (42) Ventral rows of papillae poorly developed. Metraterm about equal in length to cirrus sac. . Catatropis Odhner 1905. Body tapering only slightly, about equally rounded at both ends. Ven- tral surface with three rows of poorly developed gland masses; the middle row opens on a low keel or ridge; the lateral rows contain each eight to twelve small wart-like, non-retractile prominences. Metraterm well de- veloped, as long as cirrus sac. European species in ceciun and rectum of water birds. Representative American species. Catatropis filamentis Barker 1915. Only North American species; in the duodenum of the muskrat. Fig. 666. Catatropis filamentis. Ventral view. Magnified. (After Barker.) Nudocotyle novicia, very recently described by Barker from the muskrat, is placed in this family despite some striking morphological differences. The form is small ( to mm. long by to
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
