Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 FIG. 91, a.—The female organs of Pulex (after Stein). Ov, ovarian tubes ; Us, receptaculum seminis; V, vagina; Gl, accessory gland, b, The male generative organs of a water-bag (Nepa) (after Stein). T, testis ; Vd, vasa deferentia; 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
Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 FIG. 91, a.—The female organs of Pulex (after Stein). Ov, ovarian tubes ; Us, receptaculum seminis; V, vagina; Gl, accessory gland, b, The male generative organs of a water-bag (Nepa) (after Stein). T, testis ; Vd, vasa deferentia; 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 tke
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