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Show 1 0 2 2 MR. L. R. CRAWSHAY ON THE ARTERIAL [Dec. 11, of the more primitive condition were more or less retained. In a specimen of R. temporaria each side received ten arteries, three of which arose independently from the aorta. In B. mauritanicus there were four vessels, three of which divided into right and left branches, the fourth going to the light kidney alone. In R. clamata, five vessels went to one side and four to the other. Of these nine vessels, five had independent origins (text-fig. 152, p. 1027). In R. tigrina on each side there were eight arteries, three of which were distinct in origin. In R. catesbiana there were six arteries to each side, four of them arising quite independently from the aorta, so that here there were only two which bifurcated right and left (text-fig. 148). Text-fig. 148. Jtana catesbiana, (XI ) . A entral view of Aa. urogenitales, &c. (For explanation of the lettering, see p. 1033.) With a doubtful exception and one clear case in a specimen of Ii ^ tempo) aria, the A.a. genitales did not arise, in any of the individuals examined, independently from the aorta, but always m common with a renal vessel. Generally they separated from the renal vessel a considerable distance from the aorta, but sometimes |