. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. 484 Biology of the Vertebrates cloacal end into a "uterus" for the temporary lodgment of the eggs. Vivip- arous teleosts, as also some elasmobranchs, have a well-developed highly vascularized uterus. Mammals, however, show the greatest differentiation of this organ. A uterine modification of the oviduct, when found among lower verte- brates, is usually a double structure, one for each oviduct, but with increas- ing coalescence of the oviducts in
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. 484 Biology of the Vertebrates cloacal end into a "uterus" for the temporary lodgment of the eggs. Vivip- arous teleosts, as also some elasmobranchs, have a well-developed highly vascularized uterus. Mammals, however, show the greatest differentiation of this organ. A uterine modification of the oviduct, when found among lower verte- brates, is usually a double structure, one for each oviduct, but with increas- ing coalescence of the oviducts in mammals to form a single vagina, there is a tendency for this fusion to involve either a part or the entire uterine region. All the theoretical intermediary evolutionary stages from a double uterus to a single one have their actual counterparts in nature among 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 Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
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