. Elementary text-book of zoology. MAMMALIA. 489 those of other mammals, have a tough flexible shell and a large quantity of yolk. The segmentation is meroblastic, like, that of reptiles, and the foetal membranes are well developed, as in Sauropsida, the yolk-sac functions for store of nourishment and the allantois for respiration. The Fig. 333-—Ventral View of Male Urogenital Organs OF Ornithorhynchus. (Ad nat.) Ureter. Kidney. Epididymis. Testis. Vas Penis. Cloaca. amnion does not appear to completely separate from the serosa, hence the yolk-sac takes up the left and the allantois
. Elementary text-book of zoology. MAMMALIA. 489 those of other mammals, have a tough flexible shell and a large quantity of yolk. The segmentation is meroblastic, like, that of reptiles, and the foetal membranes are well developed, as in Sauropsida, the yolk-sac functions for store of nourishment and the allantois for respiration. The Fig. 333-—Ventral View of Male Urogenital Organs OF Ornithorhynchus. (Ad nat.) Ureter. Kidney. Epididymis. Testis. Vas Penis. Cloaca. amnion does not appear to completely separate from the serosa, hence the yolk-sac takes up the left and the allantois the right half of the egg-cavity, instead of ventral and dorsal, respectively, as in the chick. 2. Urogenital Organs.—The base of the oviducts is swollen into a so-called "uterine" part which probably. 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 Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1902
