. Fig. 143.—Eggs of Fasciola hejjatica. A, from the bile duct; B, embryonic ; C, after opening. (After Railliet.) Fig. 144.—Common liver fluke {Fasciola hepa- tica), natural size. (Stiles, Annual Report, Bureau of Agri- culture, 1901.) following parts : (1) A true germ cell, which originates in the ovary and is destined to give rise to the future embryo; (2) a number of vitelline or yolk cells, which are formed in a specialised and independent portion (vitellogene gland) of the female glands—instead of developing into embryos the yolk cells form a follicle-like covering for the true ger

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. Fig. 143.—Eggs of Fasciola hejjatica. A, from the bile duct; B, embryonic ; C, after opening. (After Railliet.) Fig. 144.—Common liver fluke {Fasciola hepa- tica), natural size. (Stiles, Annual Report, Bureau of Agri- culture, 1901.) following parts : (1) A true germ cell, which originates in the ovary and is destined to give rise to the future embryo; (2) a number of vitelline or yolk cells, which are formed in a specialised and independent portion (vitellogene gland) of the female glands—instead of developing into embryos the yolk cells form a follicle-like covering for the true germ cell, and play an important role in the nutrition of the latter as it undergoes further

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