. Fresh-water biology. Freshwater biology. 52 (49) Genital pore at or near center of margin of proglottid. Ophiotaenia grandis La Rue 1911. Very long (fragments 200 mm.), to mm. broad in ripe proglottids. First proglottids muchbroader than long; proglottids with develop- ing sexual organs quadrate or nearly so; ripe pro- glottids quadrate or much longer than broad. Head large, to mm. broad at base of suck- ers. Suckers about by mm. Testes large, numerous, 200 to 250. Cirrus-pouch to mm. broad, to mm. long, enclosing few or no coils of ductus ejac
. Fresh-water biology. Freshwater biology. 52 (49) Genital pore at or near center of margin of proglottid. Ophiotaenia grandis La Rue 1911. Very long (fragments 200 mm.), to mm. broad in ripe proglottids. First proglottids muchbroader than long; proglottids with develop- ing sexual organs quadrate or nearly so; ripe pro- glottids quadrate or much longer than broad. Head large, to mm. broad at base of suck- ers. Suckers about by mm. Testes large, numerous, 200 to 250. Cirrus-pouch to mm. broad, to mm. long, enclosing few or no coils of ductus ejaculatorius. Uterus with 40 to 60 lateral outpocketings on each side. In intestine of Ancistrodon pisciwrus Holbr., locaUty not known. Fig. 743. Ophiotaenia grandis. a, Head, showing swollen region back of head, X 8; 6, mature pro- glottid, ventral view showing reproductive organs and ventral uterine pores (m/ii^). X id. (After La Rue.). 53 (32) Many lappets or folds of tissue about suckers. Comllobothrium Fritsch 1886. Scolex with four suckers situated on the flat anterior face of the head. Many irregular folds and lappets of tissue about margin of anterior surface; may enclose suckers as in a corolla. No rostellum. No hooks nor spines. Neck broad, short. Habitat: In Siluridae. Marshall and GUbert report the occurrence of two species in the common bullhead. I have an undescribed species taken from a channel-cat at Milford, Neb. 54 (31) Vitellaria condensed, in a single mass, in medullary layer, usually immediately posterior to ovary, rarely anterior to it. Order Cyclophyllidea . 55 Scolex with 4 cup or saucer-shaped suckers and in the center an apical organ or rostellum of varied form. Hooks common on rostellum, very rare on suckers. Segmentation well devel- oped, only rarely absent (Fimbriariidae); proglottids set free after full maturity. No uterine pore; rarely a secondary connection to the exterior permits the escape of ova. Testes in medul- lary layer, ordinarily numerous.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
