. Fresh-water biology. Freshwater biology. PARASITIC FLATWORMS 413 181 (182) Body dark brown, or blackish. Cercaria hyalocauda Haldeman 1842. Very imperfectly known. The form described under this name by Evarts (1880) has a body mm. long and mm. wide with a tail mm. long and mm. wide in maximum. Cyst mm. in diameter. Body dark brown or blackish. Two eye spots and smaller, less distinct pigment mass between. Tail semitransparent, corrugated when contracted, active long after detachment from body. ^ Eyarts' description of the Uving organism shows it is much Uke C. urbanen
. Fresh-water biology. Freshwater biology. PARASITIC FLATWORMS 413 181 (182) Body dark brown, or blackish. Cercaria hyalocauda Haldeman 1842. Very imperfectly known. The form described under this name by Evarts (1880) has a body mm. long and mm. wide with a tail mm. long and mm. wide in maximum. Cyst mm. in diameter. Body dark brown or blackish. Two eye spots and smaller, less distinct pigment mass between. Tail semitransparent, corrugated when contracted, active long after detachment from body. ^ Eyarts' description of the Uving organism shows it is much Uke C. urbanensis though easily distinguishable by greater size of larva and cyst. Haldeman's account is entirely inadequate to differentiate the form and suifices only to place it in this group. Taken in numbers from P'hysa keterostropha Say by Evarts. 182 (181) Body white. Doubtful form. Cercaria (Glenocercaria) lucania Leidy 1877. Length mm. White, ovoid, with conical tail equal to or longer than body and frequently moniliform. Two eyes with intermediate black pigment spot and smaller scattered pigment spots near them. Produced in bright orange-colored sporocysts which are cylindrical and bluntly rounded at the ends. Leidy calls this a Monosloma, and all data given agree with that conclusion except that his description Usts an acetabulum which would make it a dis- tome cercaria. Abundant in Planorbis parvus found near Philadelphia, Pa. 183 (174) More than one sucker 184 184 (250) Oral sucker well developed; genital atrium not modified. 185 185 (190) Second sucker ventral and at posterior end of body. Amphistome cercariae. 186 According to studies on European species the cercaria of Paramphistoma cervis lacks pockets in the oral sucker and has a connection between the longitudinal excretory vessels. It belongs to one subfamily. All other known cercariae in this group belong to another subfamily. They have the pockets in the oral sucker and a muscular enlargement of the esophagus at the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
