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Show 1904.] ANATOMY OP CERTAIN SNAKES. 109 named snake this arrangement of the intercostals persists to the end of the body, in Eryx jaculus another arrangement comes into force further down the body which is displayed in the drawing reproduced as text-fig. 20, p. 110. First of all, i. e. anteriorly, Text-fig. 19. Part of intercostal arterial system of Eryx jaculus. Ao., right, Ad., left aortic arch ; ces., oesophageal twigs; P.v., posterior vertebral artery; V., vertebral artery. the intercostal arteries begin to arise regularly from the aorta, and, when they reach the parietes, do not form short longitudinal vessels which give off paired branches to several successive |
