. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 308 COMPARATIVE ANATOMY. wichin the pelvis, and their ventral flattened surface is usually lobulated, and often penetrated by deep furrows and clefts in which the veins lie embedded (Fig. '242, V, K) ; their posterior ends inny fuse together in the middle line, as in Lizards. There is not always a perfect symmetry between the organ of either side, and this is most marked in Snakes, in which the. FIG. 241.—EXCRETORY APPARATUS OF Monitor indicus. The right kidney is shown in its natural position,
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 308 COMPARATIVE ANATOMY. wichin the pelvis, and their ventral flattened surface is usually lobulated, and often penetrated by deep furrows and clefts in which the veins lie embedded (Fig. '242, V, K) ; their posterior ends inny fuse together in the middle line, as in Lizards. There is not always a perfect symmetry between the organ of either side, and this is most marked in Snakes, in which the. FIG. 241.—EXCRETORY APPARATUS OF Monitor indicus. The right kidney is shown in its natural position, while the left is turned on its longitudinal axis, so that the ureter and the collecting tubes are visible. The urinary bladder is not represented. A", A', kidneys ; SGf, collecting tubes which open into the ureter (Ur, Urn-} ; Url aperture of ureter into the cloaca. greatly lobulated kidneys, like those of limbless Lizards, are elongated, narrow, and band-like, in correspondence with the form of the body. A urinary bladder, arising from the ventral wall of the cloaca, is present in Lizards and Chelonians; it is usually bilolnd, as in Amphibia, and so points to a primitively paired condition. A bladder is wanting in Snakes, Crocodiles, and Birds. Mammals.—The kidneys of Mammals are proportionately small, and lie on the quaBratus lumboruin muscle and ribs. Thev usually possess a convex outer, and a concave inner border; the latter is culled tin- hi him. and at this point the ureters arise and tin- blond-vessels enter. The expanded proximal portion of the ureter is divided up to form one or more calyces (Fig. 2-i:}, ('</"), into which small papilliform processes of the pyramids (see. 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),
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