. On the anatomy of vertebrates [electronic resource] . e mature bird the urinary systemconsists of the kidneys, ureters, and a moreor less incomplete urinary receptacle. As in Reptiles the kidney is distinguishedfrom that of the Mammal by the homogeneityof its substance, which is not divided into acortical and medullary part, and by the tubuliuriniferi extending to the surface of the glandthere to form by reiterated unions the ureter,and not terminating in a cavity or pelvis inthe interior of the kidney, from which the ureter commences,, The kidneys, fig. 85, x, are two in number, of an elong
. On the anatomy of vertebrates [electronic resource] . e mature bird the urinary systemconsists of the kidneys, ureters, and a moreor less incomplete urinary receptacle. As in Reptiles the kidney is distinguishedfrom that of the Mammal by the homogeneityof its substance, which is not divided into acortical and medullary part, and by the tubuliuriniferi extending to the surface of the glandthere to form by reiterated unions the ureter,and not terminating in a cavity or pelvis inthe interior of the kidney, from which the ureter commences,, The kidneys, fig. 85, x, are two in number, of an elongatedform, commencing immediately below the lungs, and extendingalong the sides of the spine as far as the termination of the rectum ;in which course they are impacted in, and as it were moulded to,the cavities and depressions of the pelvis. From this fixed con-dition it results that they are generally symmetrical in position,not placed one higher than the other, as in the Mammalia. Theposterior surface of the kidney presents inequalities corresponding. Kidneys, Wolffian bodies, andtestes of an embryo Bird, mag-nified. LXXIV. URINARY SYSTEM OF BIRDS. 227 to the risings and depressions of the pelvis; the anterior surface issmoothly convex or flattened; but rising into a series of promi-nences which correspond, not to the eminences, but to the cavitiesof the bones on which they rest; their inner or mesial side isgenerally pretty regular and straight, but the external edge ismore or less notched. They are relatively larger than in mostMammals ; resembling in this respect the kidneys of Whales andof the cold-blooded Ovipara, where there is no perspiration fromthe skin. The kidneys vary in size in different birds, being, for example,smaller in most of the Grallatores, as the Bustard and Heron,where the pelvis is short, than in the Rasorial Order, in which itis of great extent. Where they are short they are in generalmore prominent, and this is so remarkable in some Birds, as theOwls,
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