. Fresh-water biology. Freshwater biology. 420 FRESH-WATER BIOLOGY 224 (200) Anterior end with fleshy collar and crown of spines. Echinostome cercariae . 225 These cercariae develop in rediae which have collar, birth pore, and posterior locomotor appendages. They are characterized by the conspicuous collar and spines, also found in the adult distome. The esophagus is long and the ceca reach to the posterior end of the body. The tail is long and powerful. 22s (228) Collar spines in a single, if sometimes slightly irregular row. 226 226 (227) Collar spines 42, rounded at both ends; excretory tru
. Fresh-water biology. Freshwater biology. 420 FRESH-WATER BIOLOGY 224 (200) Anterior end with fleshy collar and crown of spines. Echinostome cercariae . 225 These cercariae develop in rediae which have collar, birth pore, and posterior locomotor appendages. They are characterized by the conspicuous collar and spines, also found in the adult distome. The esophagus is long and the ceca reach to the posterior end of the body. The tail is long and powerful. 22s (228) Collar spines in a single, if sometimes slightly irregular row. 226 226 (227) Collar spines 42, rounded at both ends; excretory trunks doubly reflexed in cephalic region. . Cercaria biflexa Faust. Acetabulum in posterior third of body. Great number of cephaUc glands in 2 series, 50 to 60 in each series, lateral to digestive ceca. Excretory tubes reflexed twice in cephalic region preliminary to entering lateral trunks. Bladder long, with median swelling; scaleriform anas- tomosis of excretory tubules in tail. Body length to mm., width to mm. Tail about same length as body, powerful. Encysts within redia. Redia with "feet" in posterior third of body. In liver tissue of Physa gyrina Say, near Buckhouse Bridge, Bitter Root River, Montana. 227 (226) Collar spines 36, acute at distal end; excretory trunks arising from triangular anastomosis in cephalic region. Cercaria trisolenata Faust. Deltoid anastomosis of tubules from 3 flame cells in cephalic region, preliminary to entering lateral trunks. Excretory bladder obtrimcate. Acetabulum spinose in posterior third of body. Readily encysts in free state, easily drops tail. Body length mm., width mm. Tail short, about mm. Rediae with lateral "feet" about one-third distance from anterior end. In liver of Physa gyrina Say and Planorhis trivolvis Say. Entire length of Bitter Root River, Montana. 228 (225) Collar spines in mature cercariae in two alternating rows; excre- tory trunks reflexed once. . 229 229 (230) Excre
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
