. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. GENITAL ORGANS 473 from its termination, each oviduct in Anurans becomes dilated to form a thin-walled sac, in which the eggs, covered by a gelatinous coating from the glands in the wall of the middle part of the oviduct, become collected before oviposition : after again narrowing, it usually opens separately on a papilla on the dorsal wall of Ot Od-—. FIG. 356.—URINOGENITAL ORGANS OF A FEMALE Hmin <x<-nl, ntn. From the ventral side. N, kidneys ; Od, oviduct; Ot, abdominal aperture of oviduct; Or, left ovary (that o
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. GENITAL ORGANS 473 from its termination, each oviduct in Anurans becomes dilated to form a thin-walled sac, in which the eggs, covered by a gelatinous coating from the glands in the wall of the middle part of the oviduct, become collected before oviposition : after again narrowing, it usually opens separately on a papilla on the dorsal wall of Ot Od-—. FIG. 356.—URINOGENITAL ORGANS OF A FEMALE Hmin <x<-nl, ntn. From the ventral side. N, kidneys ; Od, oviduct; Ot, abdominal aperture of oviduct; Or, left ovary (that of the right side is removed) ; P, opening of oviduct into the cloaca ; iS', iSn, apertures of urinary ducts into the cloaca, surrounded by longitudinal folds (*), which are separated by a deep depression (t); Ut, the dilated posterior end of the oviduct. the cloaca: in the genera Bufo and Alytes the two oviducts fuse posteriorly into an unpaired 1 In Epicrium glutinosutn (<4ymnophiona) the ripe eggs are very similar to those of Sauropsida : they are exceptionally large (9 mm. long), are of an oval shape, possess a large yolk, and the segmentation is merob/a*fic, and takes place in the oviduct. After fertilisation they become coated with tough albumen in the oviduct, and this is drawn out at the poles into chalaza?, by means of which the eggs are connected together like the bends of a necklace. The eggs are laid in the earth, the mother coiling herself round Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, Macmillan and co. , limited
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