326 



ANIMAL BIOLOGY. 



[Part II. 



a protrusible cirrus (ci.) lodged in a cirrus sac. This is situated 

 ventrally between the two suckers. 



The ovary (ovy.) is branched and tubular. From it an ovarian 

 duct meets the ducts of the large yolk-glands or vitellcvria, which 



. v.l .. t. 



FIG. 96. LIVER-FLUKE : ORGANS OF GENERATION. 



"br. di. Branches of digestive system, ci. Cirrus, o. s. Oral sucker, ovd. 

 Oviduct crowded with ova. ovy. Ovary, p. s. Posterior sucker, ph. 

 Pharynx, sh. gl. Shell gland, ts. Testis. vi. Vitellarium. vi. d. Duct of 

 vitellarium. 



lie one on each side of the body, and are composed of a multi- 

 tude of small branches terminating in rounded masses. Beyond 

 the points of union of ovarian and vitelline ducts, an oviduct or 

 uterus conveys the ova to an aperture near the base of the cirrus. 

 A shell gland (sh. gl) is situated at the junction of the ovarian 



