. Comparative anatomy and physiology. Chap, vii.] SAUROPSIDA ; MAMMALIA. 261 Cv Ao FK kidneys of the Amniota obtain in the relative position of the two organs; in Snakes, for example, not only are the kidneys elongated in relation to the general form of the body, but »/ * one lies a good deal in front of the other ; this difference of level between the two kidneys, which is clearlv an arrange- inent for more con- venient packing, may be seen also in some Mammals (rabbit) ; secondly, the kidneys vary considerably in their external form ; thus, those of the lizard are only slightly, those of the
. Comparative anatomy and physiology. Chap, vii.] SAUROPSIDA ; MAMMALIA. 261 Cv Ao FK kidneys of the Amniota obtain in the relative position of the two organs; in Snakes, for example, not only are the kidneys elongated in relation to the general form of the body, but »/ * one lies a good deal in front of the other ; this difference of level between the two kidneys, which is clearlv an arrange- inent for more con- venient packing, may be seen also in some Mammals (rabbit) ; secondly, the kidneys vary considerably in their external form ; thus, those of the lizard are only slightly, those of the Ophidia much more, broken up into lobes; this is a difference, also, which obtains between young and old forms, for in the latter the number of lobes is much greater than in the former. In Birds the lobes fit into the spaces between the trans- verse processes of the vertebrae of the pelvic region, The lobes of the kidney, after appearing, do, in many Mammals, again fuse with one another, so that while the Cetacea, in which this process does not obtain, may have as many as two hundred lobes, the. ;. 108.—Urogenital Apparatus of a Male Frog. , Kidneys ; ur ur, ureters; + tbeir point of origin ; s s', their opening into the cloaca Cl, H o, testes ; FK, fat body; AO, aorta; cr, vena cava inferior; vr, efferent veins. (.After Wiedersheim.). 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 Bell, F. J. (Francis Jeffrey), 1855-1924. London, Cassell
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