Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 Jls FIG. 91, a.—The female organs of Pulex (after Stein). Ov, ovarian tubes ; 22s, receptaculum semiuis; V, vagina; Gl, accessory gland, b, The male generative organs of a water-bug (Nepa) (after Stein). T, testis ; Vd, vasa defereutia; Gl, accessory glands; D, ductus ejacu- latorius. from structures serving quite another purpose (segmental organs). The oviducts, in their course, may receive glandular appendages of various kinds which furnish yolk for the nourishment of the ovum, or albu
Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 Jls FIG. 91, a.—The female organs of Pulex (after Stein). Ov, ovarian tubes ; 22s, receptaculum semiuis; V, vagina; Gl, accessory gland, b, The male generative organs of a water-bug (Nepa) (after Stein). T, testis ; Vd, vasa defereutia; Gl, accessory glands; D, ductus ejacu- latorius. from structures serving quite another purpose (segmental organs). The oviducts, in their course, may receive glandular appendages of various kinds which furnish yolk for the nourishment of the ovum, or albumen to surround it, or material for the formation of a hard egg-shell (chorion). These functions may be sometimes discharged by the ovarian wall (Insects), so that the egg when it enters the oviduct has taken up its accessory yolk and acquired its firm egg- shell. Very often the ducts also discharge these various functions, and are divided into corresponding regions ; they are often dilated at part of their course to form a reservoir for the retention of the
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