SnO MR. F. E. BEDDARD OX THE [Feb. 16, 



vessels gives off" braiaehes to the fat-bocly. The posterior supra- 

 renal body, I may remark, receives only one portal branch, in Avhich 

 it diifers from the anterior suprarenal. 



The oviducal artery of the jDosterior oviduct arises after the 

 inferior mesenteric (which immediately follows the ovarian artery) 

 and the first renal arteiy. Its origin is distinctly from the left 

 side of the aorta, as is that of the ovarian artery ; this position is 

 marked by the median ventral origin of the inferior mesenteric. 

 The first branch given off" joins the longitudinally running ovarian 

 artery ; about halfway between its origin from the aorta and the 

 oviducal walls a stout branch arises which goes, I believe, to the 

 fat-body *, The artery then passes straight to the longitudinal 

 artery of the oviduct, without giving ofi^ anything more than very 

 minute branches. 



The second oviducal artery arises at the same distance behind 

 the third t intestinal artery as the first oviducal arteiy is behind 

 the inferior mesenteric. The peculiarity about this artery is that 

 as it turns round the anterior end of the posterior kidney it gives 

 off a branch to that organ. Thereafter follows a series of arteries 

 which are the renal arteries, though they largely give off" branches 

 to the oviduct ; they are dealt with below. Behind the kidney 

 a series of small vessels arises from the aorta to supply the walls 

 of the oviduct ; similar vessels arise on the opposite side of the 

 aorta and supply the other oviduct. 



Spermatic Arteries. — Of these there are only two, one for each 

 testis. The anterior testis is considerably the larger gonad. The 

 a,rtery of the anterior testis is the first viscei'al artery after the 

 superior mesenteric. Before reaching the suprarenal capsule it 

 gives off" a strong branch which runs dorsally of the testis to the 

 fet-body. It forms a longitudinal artery running along the supra- 

 renal and the testis, which is posteriorly continued along the vas 

 defei-ens. Anteriorly the spermatic artery branches into a few 

 slender tubes which are lost on adjacent mesenteries and possibly 

 also supply the fat-body. The suprarenal receives two poi'tals, 

 one at each end — exactly as does the corresponding suprarenal of 

 the female snake. Similarly the posterior suprarenal has only a 

 single portal vein. The second spennatic artery does not give oW 

 any well-marked branch to the fat-body ; bvit there may be 

 slender twigs. 



Renal Arteries. — The renal arteries of the anterior (right-hand) 

 kidney are largely mixed up with arteries supplying the oviduct, 

 indeed all the renal artei'ies provide branches for that I'egion of the 

 oviduct which lies opposite to the kidney. There are four of them 

 altogether, of which the first is rather farther apart from the others 

 than they are from each other. The first of these arteries springs 

 from the aorta between the inferior mesenteric and the oviducal 

 artery of the posterior oviduct. Arrived at the edge very near to 



* The fact that the artery had accidentally been liroken does not alloAv me to speak 

 positively. 



\ Reckoning- the superior mesenteric as the first. 



