1904.] CIRCULATORY SYSTEM m THE OPIIIDIA. 351 



its anterior boundary, tliis aiteiy divides into three. The outer 

 one bends round the anterior end of the kidney and, after giving 

 off two small branches to the kidney-substance, goes to the 

 oviduct ; the second branch crosses the kidney, gives off a 

 branch to the kidney-substance, and then passes on to the 

 oviduct ; the third branch forms the longitudinal renal artery 

 which runs along the inner margin of that organ. The ureter 

 and the afferent renal vein which lie on the flat ventral sur- 

 face of the kidney receive a branch from a vessel which 

 arises fi-om the longitudinal renal trunk between its first two 

 affluents from the aorta. The second renal artery divides into 

 two branches just before reaching the edge of the kidney which 

 form the longitudinal renal vessel ; the anterior branch gives 

 off a vessel which crosses the kidney, and, after giving off a 

 branch to the longitudinal trunk running down the ureter, 



Text-fig. 69. 



Spermatic and iieighl)Ouring arteries of Tropidonotusfaseiatus. 



Ao., aorta ; F.H., fat-l)0(ly arteries ; I.M., inferior mesenteric artery ; Int., intestinal 

 arteries; R^, renal arteries of rijrht kidney; J?-, do. of left kidney; Sp. 2, 

 spermatic artery of left testis; Sr., suprarenal l)ody ; S;-.', suprarenal portal 

 veins (left white) ; T., right testis. 



becomes an oviducal artery ; some little way before reaching the 

 oviduct it sends back two branches to the uretei-. The third 

 renal artery as well as the foui'th supply the kidney-substance, 

 the longitudinal renal artery, the ureter, and the oviduct. A 

 little way beyond the end of the kidney the ureter receives a 

 special branch from the aorta. Beyond this, again, a special branch 

 supplies the oviduct. The left kidney is supplied by arteries 

 whose arrangement is much that of those of the opposite kidney. 

 There are four of them altogether. The fii'st arteiy is, as has 

 been also mentioned elsewhere, mainly an oviducal ai'teiy. Arrived 

 at the kidney this vessel emits a strong branch which is the be- 

 ginning of the longitudinal artery of the kidney ; a little farther 

 on, as it curves round the end of the kidney, it gives off one or 

 two small branches which plunge into the substance of the kidney. 

 The second renal artery ai-ises fi-om the aorta behind the third 

 renal artery of the opposite kidney. It is purely i-enal in distri- 

 bution and gives off no branch to the oviduct. The third and 



