. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. The Preservation of Species 471 In those animals that produce many eggs at one time, as the frog for example, the oviducts temporarily become enormously elongated and con- voluted during the egg-laying season (Fig. 395). The oviduct of a pullet which has not begun to lay eggs is about six or seven inches in length, whereas in an egg-laying hen it is four times as long. Opening of oviduct into coelom- •Dorsal cloaca MALE FEMALE Fig. 395. The reprodu
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. The Preservation of Species 471 In those animals that produce many eggs at one time, as the frog for example, the oviducts temporarily become enormously elongated and con- voluted during the egg-laying season (Fig. 395). The oviduct of a pullet which has not begun to lay eggs is about six or seven inches in length, whereas in an egg-laying hen it is four times as long. Opening of oviduct into coelom- •Dorsal cloaca MALE FEMALE Fig. 395. The reproductive organs of the frog. (From Woodruff, Animal Biology, copyright 1941 by permission of The Macmillan Company, publishers.) Among higher vertebrates the oviducts are made up of Fallopian tubes for the reception of the eggs from the ovaries, and nearer their exit they undergo extensive elaboration into uterus and vagina, modifications to be considered later. Miillerian ducts are also present embryonically in the male, but in the adult they suffer various degrees of degeneration. The lungfish, Neocera- todus, and the newt, Triton, as well as the leopard frog, Rana pipiens, are exceptional cases, showing persistent Miillerian ducts in the adult 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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