. Fresh-water biology. Freshwater biology. PARASITIC FLATWORMS 417 204 (210) Cauiial pocket present, distinct, devoid of hooks or spines. 205 205 (206, 207). Ceca short, lateral trunks of excretory bladder circumscribe acetabulum C. brevicaeca Cort 1914. Body elongate oval, mm. long, mm. wide. Tail caducous, slender in length about equal to body. Oral sucker mm., ace- tabulum mm. in diameter. Stylet glands 10 to 12 on each side. Intestinal ceca short. Anterior half of body spinous. A poor swim- mer. Found In sausage-shaped sporocysts in liver of Pkysa analina from Manhatta
. Fresh-water biology. Freshwater biology. PARASITIC FLATWORMS 417 204 (210) Cauiial pocket present, distinct, devoid of hooks or spines. 205 205 (206, 207). Ceca short, lateral trunks of excretory bladder circumscribe acetabulum C. brevicaeca Cort 1914. Body elongate oval, mm. long, mm. wide. Tail caducous, slender in length about equal to body. Oral sucker mm., ace- tabulum mm. in diameter. Stylet glands 10 to 12 on each side. Intestinal ceca short. Anterior half of body spinous. A poor swim- mer. Found In sausage-shaped sporocysts in liver of Pkysa analina from Manhattan, Kansas. Fig. 720. Cercaria brevicaeca; a, free hand drawing, ventral view. Cys- togenous glands not shown. X about loo. b, stylet, ventral view. X 290. (After Cort.) 206 (205, 207) Ceca arise directly from pharynx region, excretory bladder muscular, crenate, capable of great distension. Cercaria crenata Faust. Body length mm., width mm. Tail weak, to mm. in length, to mm. wide at base. Body oblong-ovate, with deep pocket at posterior extremity for reception of tail. Stylet glands 13, 8 in outer series and 5 in irmer series, minute, extending to mid- acetabular region. Esophagus lacking. Sporocysts small oblong-ovate. In liver tissue of Lymnaea proxima Lea from springs at Fort Missoula, Montana. 207 (205, 2c6) Ceca undeveloped, excretory bladder bicornuate. . 208 Cort regards these forms as a natural group characterized by development in elongate sac- shaped sporocysts in Gastropoda, with a slender tail, not usually shorter than the body, with a small post-central acetabulum, a stylet 30 j« long, with six or more stylet glands on each side in front of acetabulum, and a bicornuate excretory bladder. He considers that they prob- ably belong to the Plagiorchiinae. Nothing is known regarding the development of the American species. 208 (209) Six stylet glands on each side. Cercaria isocotylea Cort 1914. Develops in sporocysts. Tail small, very exten
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
