. Fresh-water biology. Freshwater biology. PARASITIC FLATWORMS 437 42 (43) Cirrus-pouch extends half way across proglottid. Proteocephalus exiguus La Rue 1911. Strobila short, slender, length 9 to 38 mm., maximum breadth to mm. First proglottids longer than broad or nearly quad- rate; mature and ripe proglottids longer than broad, ripe proglottids considerably larger, to mm. long by to mm. broad. Sucliers mm. broad, to mm. long. Genital pore near middle of lateral mar- gin of proglottid. Testes 34 to 54 in number, in one layer. Vas deferens f
. Fresh-water biology. Freshwater biology. PARASITIC FLATWORMS 437 42 (43) Cirrus-pouch extends half way across proglottid. Proteocephalus exiguus La Rue 1911. Strobila short, slender, length 9 to 38 mm., maximum breadth to mm. First proglottids longer than broad or nearly quad- rate; mature and ripe proglottids longer than broad, ripe proglottids considerably larger, to mm. long by to mm. broad. Sucliers mm. broad, to mm. long. Genital pore near middle of lateral mar- gin of proglottid. Testes 34 to 54 in number, in one layer. Vas deferens forming mass of coils in mid-field. Vagina anterior to cirrus- pouch, crossing it near middle. Uterus with 9 to 14 lateral pouches on either side. In intestine of Coregonus nigripinnis, C. prog- nathus, and C. artedi, Lake Fig. 737. Proteocephalus exiguus. a, Head, su, fifth sucker, X 93; b, mature proglottid, X 60 (After La Rue.) 43 (42) Cirrus-pouch less than one-third breadth of proglottid. 44 (45) Testes in one layer. 44 Proteocephalus pinguis La Rue 1911. Strobila short, slender, length up to 90 mm., maximum breadth mm. First proglottids very short. Mature and ripe proglottids nearly quadrate or in a few ripe proglottids length exceed- ing the breadth. Genital pore at or near middle of lateral margin of proglottid. Testes 54 to 70, in a single layer. Cirrus- pouch short, stout, to mm. long by to nun. broad, i : 3 or I : 4 in breadth of proglottid. Va- gina anterior, but vaginal opening al- ways dorsal to cirrus-pouch. Vagina crossing iimer end of cirrus-sheath. Uterus with 10 to 14 lateral pouches on either side. In intestine of Esox reticulatus Le Fig 738. Proteocephalus pinguis. a, Head in dorsal or Sueur, and E lucius Lhm., Maine, ventral view, X 4S; b, ripe proglottid, utl, lateral uterine Michigan, and Wisconsm. pouches, ventral view, X 63. (After La Rue.) Proteocephalus pusillus Ward 1910. Very small, weak; length 30 to 50 mm., maxi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
