. Fresh-water biology. Freshwater biology. 418 FRESH-WATER BIOLOGY 209 (208) Twelve stylet glands on each side. Cercaria polyadena Cort 1914. Encysts readily. Tail active, easily detached, somewhat larger than in last species. Oral suclter smaller, stylet glands more numerous. Body also larger than former species. Genital system marked out by S-shaped nuclear mass, elongate and dorsal to acetabulum. 1* Cercaria polyadena; a, ventral view. Cystogenous glands not shown. X 207. b, stylet, ventral view. X 290. (After Cort.) 210 (204) Caudal pocket distinct, provided with hooks or spines tha
. Fresh-water biology. Freshwater biology. 418 FRESH-WATER BIOLOGY 209 (208) Twelve stylet glands on each side. Cercaria polyadena Cort 1914. Encysts readily. Tail active, easily detached, somewhat larger than in last species. Oral suclter smaller, stylet glands more numerous. Body also larger than former species. Genital system marked out by S-shaped nuclear mass, elongate and dorsal to acetabulum. 1* Cercaria polyadena; a, ventral view. Cystogenous glands not shown. X 207. b, stylet, ventral view. X 290. (After Cort.) 210 (204) Caudal pocket distinct, provided with hooks or spines that are mostly situated in postero-lateral sacs. . 211 211 (212) Digestive tract naked, ceca rudirhentary. Cercaria dendritica Faust. Body length to mm., width to mm. Tail small, mm. in length, mm. wide at base. Body obovate, muscular; cuticula thick. Caudal pocket lined with spines. Excretory bladder large, muscular, bicomuate; tubules dendritic. In long oval sporo- cysts in liver of Lymnaea proxima Lea, sloughs of Bitter Root River, Fort Missoula, Montana. 212 (211) Digestive tract provided with special glands, in addition to stylet glands. Ceca developed 213 213 (214) Glands along entire course of digestive tract. Three median spines on lip of caudal pocket. Cercaria glandulosa Faust. Body length mm., width mm. Tail length mm. by to mm. at base. Body oblong-ovate, acetabulum sHghtly behind center of body, smaller than oral sucker. Esophagus long, ceca short, unicellular glands along entire digestive system. Cuticula delicate. Eight cephalic glands. Body filled with cystogenous glands. In sporocysts, in Uver of Physd gyrina Say, Bitter Root River, Corvallis, Montana. 214 (213) Glands in pharynx region only, spines confined to pockets of caudal pocket. .... . 215 215 (216) Ceca attenuate, excretory bladder with long median shank. Cercaria diaphana Faust. Body oblong-ovate to ovate. Acetabulum median, about half size of oral s
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
