. Fresh-water biology. Freshwater biology. PARASITIC FLATWORMS 403 130 (139) Receptaculum seminis present (except Plagiorchis); crura reach posterior end (except Styphlodora) 131 131 (138) Vesicula seminalis fills greater part of cirrus sac; pars prostatica follows after it and is very short. Subfamily Plagiorchiinae Liihe 1909. . 132 132 (13s) Genital pore near oral sucker 133 133 (134) Testes median or nearly so Pneumonoeces Looss 1902. Medium sized distomes, with body elongate, thick, and only slightly flattened, tapering an- teriorly. Acetabulum small. Oral sucker large, pharynx well devel
. Fresh-water biology. Freshwater biology. PARASITIC FLATWORMS 403 130 (139) Receptaculum seminis present (except Plagiorchis); crura reach posterior end (except Styphlodora) 131 131 (138) Vesicula seminalis fills greater part of cirrus sac; pars prostatica follows after it and is very short. Subfamily Plagiorchiinae Liihe 1909. . 132 132 (13s) Genital pore near oral sucker 133 133 (134) Testes median or nearly so Pneumonoeces Looss 1902. Medium sized distomes, with body elongate, thick, and only slightly flattened, tapering an- teriorly. Acetabulum small. Oral sucker large, pharynx well developed, esophagus short, in- testinal crura long, extending to posterior end. Genital pore just behind oral sucker, median, ventral. Cirrus sac greatly elongate, reaching acetabulum. Ovary near acetabulum. Testes postovarian, sUghtly oblique. Large seminal receptacle between testes and ovary. No Laurer's canal. Vitellaria lateral in middle region of body. Uterus much coiled, extending to extreme posterior end. Eggs numerous, small, dark shelled. In lungs of Anura; widely distributed and abundant. Develop perhaps from Xiphidiocer- cariae. North American species well worked out and described with key by Cort. Representative American species. Pneumonoeces coloradensis Cort 1915. Fig. 699. Pneumonoeces coloradensis. FuUy developed specimen, ventral view, receptacle. X 27. (After Cort.) 0, ovary; sr, seminal 134 (133) Testes lateral and symmetrical or nearly so. PneumoUtes Ward. Much like Pneumonoeces but body larger, thicker, with testes lobed, elongate, lateral and symmetrical or only shghtly oblique. Extracecal longitudinal folds of uterus pronouncedly longer than in Pneumonoeces. Ovary lobed. Vitellaria with many very small acini in each group. Eggs small. In lungs of Anura. Two species in North America: P. longiplexus, P. breiiplexus. Cort, who grouped these in Pneumonoeces, called attention to their close relationship. The points of resemblance constitute also characteristic dif
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
