. Fresh-water biology. Freshwater biology. 386 FRESH-WATER BIOLOGY 52 (51) Postero-lateral pockets present on pharynx. S3 53 (56) Testes two, more or less deeply lobed. Subfamily CLAuORCHnNAE Fischoeder 1901 54 Amphistomes with more or less strongly flattened body, and with acetabulum usually con- spicuously ventral, rarely only terminal. Testes branching or lobed. Cirrus sac incom- plete or nearly wanting. In this subfamily belongs possibly the "Amphistoma grande Diesing" of Leidy from the terra- pin which does not seem to conform to the species designated. The description is inadeq
. Fresh-water biology. Freshwater biology. 386 FRESH-WATER BIOLOGY 52 (51) Postero-lateral pockets present on pharynx. S3 53 (56) Testes two, more or less deeply lobed. Subfamily CLAuORCHnNAE Fischoeder 1901 54 Amphistomes with more or less strongly flattened body, and with acetabulum usually con- spicuously ventral, rarely only terminal. Testes branching or lobed. Cirrus sac incom- plete or nearly wanting. In this subfamily belongs possibly the "Amphistoma grande Diesing" of Leidy from the terra- pin which does not seem to conform to the species designated. The description is inadequate for a final diagnosis. 54 (S5) Pharyngeal pockets small, sucker not affecting external boundary of oral . . Stichorchis Fischoeder Body noticeably attenuated anteriorly, broadly rounded posteri- orly. Margins rounded, dorsal surface high, arched, ventral flattened. Acetabulum ventral. Pharynx lacking; crura not much separated from lateral margins. Cirrus sac small, genital sucker not conspicu- ous. Vitellaria well developed, mostly behind testes and median to crura, as well as partly dorsal and ventral to same. North American species. Stichorchis subiriquetrus (Rudolphi) 1814. One species, St. suhtriquetrus, the true Amphistoma suhtriquetrum Rud. In intestine of the beaver; Quebec, Ontario. Fig. 670. Stichorchis subtriquetrus. Dorsal view to show arrangement of parts. Magniiied. (After Dufi.) 55 (54) Pharyngeal pockets large, conspicuous, modifying greatly outline of oral sucker. . Wardius Barker and East 1915. Moderate sized amphistomes with prominent pharyngeal pockets, and large subterminal sucker. Esophagus well developed, without differ- entiated regions; crura long and wavy. Testes slightly lobed, tandem, in center of body. Ovary median, behind testes near posterior sucker. Genital pore posterior to bifurcation of intestine. Vitellaria extend out- side crura from oral to posterior sucker. Only one species. Wardius zibethicus Barker and East Please note
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
