. Fresh-water biology. Freshwater biology. PARASITIC FLATWORMS 401 120 (123) 121 (122). Intestinal crura short, diverging, not passing acetabulum. 121 Testes symmetrical, lateral, postacetabular. Subfamily Microphallinae Ward 1901. Small distomes having pear-shaped body with mobile anterior region containing alimentary system. Suckers small, prepharynx, pharynx and long esophagus present; crura short, not surpassing acetabulum. Excretory system V-shaped. Genital pore sinistral, rarely post- acetabular. No cirrus-sac. Seminal vesicle immediately preacetabu- lar. Testes symmetrical, behind aceta
. Fresh-water biology. Freshwater biology. PARASITIC FLATWORMS 401 120 (123) 121 (122). Intestinal crura short, diverging, not passing acetabulum. 121 Testes symmetrical, lateral, postacetabular. Subfamily Microphallinae Ward 1901. Small distomes having pear-shaped body with mobile anterior region containing alimentary system. Suckers small, prepharynx, pharynx and long esophagus present; crura short, not surpassing acetabulum. Excretory system V-shaped. Genital pore sinistral, rarely post- acetabular. No cirrus-sac. Seminal vesicle immediately preacetabu- lar. Testes symmetrical, behind acetabulum. Ovary dextral, along- side of acetabulum. Vitellaria symmetrical, behind testes, in form of a lobed mass of follicles. Uterus coiled in posterior region, ex- tending anteriad about as far as posterior margin of acetabulum. Eggs small, very numerous. In intestine of water birds and fishes. Representative American genus. Microphallus Ward 1901. One species {M, opacus) in Amia calva, Micropterus dolomieu, An- giiUla chrysypa, Ictalurus punctatus, Perca Jlavescens; the young dis- tome encysted in crayfish. 695. Microphallus opacus. Ventral view; dotted line represents limits of coils of uterus, fiUed with eggs. X 37. (After Ward.) 122 (i2i) Testes oblique, in center of body, posterior to acetabulum. Protenteron Stafford 1904. Small distomes. Broadest at center, narrowed behind. Skin spinous. Oral sucker termi- nal, mm., acetabulum mm. in diameter. Prepharynx longer than pharynx or esophagus. Crura short, ^ diverging, not passing acetabulum. Black eye spots lateral to pharynx. Testes oblique in center of body behind acetabulum. Ovary in front of left testis. Uterus reaching posterior end. Vitellaria lateral, short, from fork of intestine to near ovary. Cirrus (and sac ?) extending posteriad to ovary. Eggs 22 by 11,11. Type species. . Protenteron diaphanum Stafford 1904. Intestine of AmUoplUes rupestris; Montreal, Canada. 123 (120) Intestinal crura extend beyo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
