44 
tine with pharynx closely following the oral sncker; esophagus moderately long; 
ntestinal ceca simple, extending to extreme aboral end of body. Genital pore postero- 
lateral of and in immediate %'icinity of ventral acetabulum; it is surrounded by a 
muscular ring genital ring), the outer free margin of which is provided with a not 
quite complete wreath of bent chitinous rods with lateral branches. True copulatory 
organs absent: male and female genital tubes unite before reaching the pore, thus 
forming a genital cloaca, ^fale orgam: Testicles oval, in extreme aboral end of bcdv, 
on same transverse plane, their longitudinal axis nearly at right angles to the lon^i- 
Fig. 66. — ^Ventral view of Heterophyes heterophye.?. enlarged to show the anatomy: ac.. acetabulum; 
es., esophagus; cjr. p.. excretory pore; y. c.. cerebral ganglion; gl.. glands; g. p.. genital pore; 
g. I-., genital ring; intestinal ceca; L. e.. Laurer's canal; m.. mouth with oral sucker; oo., ootyp; 
or., ovary; p. h.. pharyngeal bulb; p. p.. prepharyux; p. pr.. pars pn>statica; r. -s.. receptaculum 
seminis; f.. testicle; uf., uterus; ra., vagina imetraterm); r. d.. vas deferens; r. g.. vitellogene 
glands: r. -s.. vesicula seminalis: r. t.. vitelloduct. i After Looss. 16^. fig. 1. 1 
tudinal axis of the body ; vesicula seminalis flexed, anterior end of latter forming a 
pars prostatica, both lying free in the parenchyma. Female organs: Ovary globular, 
median, or lateral, anterior of testicles; receptaculum seminis as large as ovary and 
building a sac-like ev agination of Laurer's canal; vitellaria but shghtly developed, 
situated on the margins of the posterior ditflsion of the body. Uterine coils not 
numerous; they extend laterally nearly to the aboral end. never jKisterior of the 
testicles, and not anterior of the ventral acetabulum. Eggs not numerous, with 
dark colored thick shell, 20 to 30// by 10 to 17//. 
Habitat. — Intestine of mammals and birds. 
Type species. — Heterophyes heterophyes Siel/old, 1853) Stiles, 1901. 
