TREMATODA. 185 
vesicle lie in a space or ‘‘cirrus sac” between the ventral sucker and 
the external male genital aperture. The ovary is also branched, but 
Fic. 96.—Reproductive organs of liver fluke. 
—After Sommer. 
J. Female aperture. ov. Ovary (dark). 
s.z. Seminal vesicle. ut, Uterus. 
y.gl. Diffuse yolk glands. e.s. Cirrus sac. 
sh.g. Shell gland. p. Penis. 
v.d. Vas deferens. m. Mouth. 
7. Testes (anterior). g. Anterior lobes of gut. 
less so than the testes. The ova pass from its tubes into an ovarian 
duct. Nutritive cells are gathered from very diffuse yolk glands, 
collected in a reservoir, and pass by a duct into the end of the afore- 
