1904.] CIRCULATORY SYSTEM IX THK OPIIIDIA. 855 



Genital Ai-teries. — It is remarkable that both the ovary and 

 testes, in spite of the disproportion of their size, are each of them 

 furnished with a single artery only ; that is to say, of course, 

 there is a separate artery to each ovary and to each testis. The 

 artery supplying the anterior testis is the first artery which 

 springs from the aorta after the superior mesenteric ; it is 

 closely accompanied by a parietal portal vein. Then follow 

 six arteries which supply the vas deferens and the suprarenal. 

 But of these six, the first and the last but one are mainly 

 (perhaps really exclusively) fat-body arteries. After them arises 

 the artery of the second, posterior, testis ; this is given ofi" close 

 to the inferior mesenteric. I am uncertain how many arteries 

 supply the vas deferens of this testis. Three parietal portals lie 

 among these vas deferens arteries. 



The ovarian and oviducal arteries are very similar in their 

 arrangement. The artei-y of the anteriorly-situated ovary is also 

 the first artery to spring from the aorta after the origin of the 

 superior mesenteric, but it is placed farther forwards than in the 

 case of the testicular ai-tery. It is closely accompanied by a 

 branch of the portal ; it is followed by two oviducal arteries, 

 of which the second gives off a large branch to the fat-body. 

 Near to each of them is a parietal branch of the portal. Then 

 comes the ovarian artery of the posterior ovary. This is followed 

 by two oviducal arteries ; after which comes the second fat-body 

 artery. This is again followed by two oviducal arteries, between 

 which lies a parietal portal vein. All these arteries lie in front 

 of the inferior mesenteric, which is the next artery to follow. 



Ophiophagus bungarus. 



In this species the much shorter left aortic arch gives off five 

 quite slender vessels to the oesophagus before it joins the right 

 aorta. The latter, at the point of junction, is about one-third of 

 the diameter of the former. 



The right aorta gives off four intercostals before it fuses with 

 the left arch. These intercostals agree with the entire series in 

 perforating the body-wall in the middle line. This state of 

 afiairs is apparently without exception, and is thus characteristic 

 of the species, as it is of Lachesis gramineiis. There are about 

 80 of these arteries * from the junction of the a;orta to the 

 end of the body ; they are, as usual, given ofi" at irregular 

 intervals, sometimes closer, sometimes further apart. Below the 

 muscles each artery divides at once into a right and left branch. 



The anterior vertebral runs up the neck to within an inch of 

 the head, giving off" median intercostals ; these are very nearly 

 one to each successive vertebra, but the arrangement is not 

 quite regular. 



I counted 24 arteries supplying the oesophagus and liver, 



* I cannot be certain to two or three, as the hijection was deficient posteriorlj'. 



23* 



