518 MR. F, E, BEDDARD ON THE [ Apr. 27, 
(2. e. below” when the animal is dissected, as is usual, from the 
ventral surface) for some distance in front of the point where it 
emerges from between the divergent iliac arteries accurately in 
the middle line. This is, of course, only an exaggeration of the 
prevailing EKutherian condition. Still it is notewor tihy that a new 
kind of symmetry in the relation of vein and artery precisely the 
reverse of that characteristic of the Marsupials should be visible in 
these Murines, Finally, in both of these species the spermatic 
vein entered the iliac vein of its side, and was thus not directly 
connected with the postcaval or renal, as is the usual state of 
affairs in Kutherian Mammals. 
In Georhychus capensis (text-fig. 139 C) the veins with which I 
am concerned in the present communication are different from 
those of some other Rodents. The renal veins are not situated 
opposite to each other, the left being below the right. The right 
ovarian vein is symmetrical with the left renal and passes, like it, 
almost at right angles to the postcava, the ovary of that side 
being situated to the outside of and not much behind the kidney. 
It gives off two branches which run at right angles to it and 
parallel with the postcava along the ureter and the oviduct. On 
the left side the ovarian vein joins the left renal, but before it 
joins receives a vessel running along the oviduct. The renal 
vein nearer to its embouchure into the postcaval receives a slender 
vein which runs along the ureter. Posteriorly there is a caudal 
vein which opens into the left of the two iliac veins which together 
form the posteaval. Dipus hirtipes (text-fig. 138 C, p. 517) does not 
differ much from Georhychus. But the right ovarian vein flows 
into the postcaval rather nearer to the right renal. 
Graphiurus murinus is, i many respects, like Georhychus 
capensis. The renals are even more asymmetrical, the space of 
postcava left between their respective mouths being greater. The 
left suprarenal vein enters the postcava opposite to the right 
renal. Between the two renals enters the right ovarian vein ; 
this is, as in Georhychus, at right angles or nearly so to the post- 
caval stem, and, as in the Rodent mentioned, receives an ascending 
vein which runs along the oviduct. On the left side of the body 
the ovarian vein enters the left renal; but the latter vein, instead 
of being at right angles with the posteava or sloping poster iorly, 
1S directed rather ‘anterior ly. This ovarian vein receives an 
ascending branch as does the right ovarian vein. 
In Sciurus prevosti (text-fig. 138 A) the renal veins were 
asymmetrical in the usual fashion. The ovarian veins were 
symmetrical and situated far back, flowing into the postcaval not 
far in front of the union of the iliacs. Between these veins and 
the left renal there were three unpaired intercostal veins. Sciwrus 
cinereus was the same, except that the two spermatic veins 
appeared to open into the postcava by a common stem. In front 
of this were two lumbar parietal veins, of which the left-hand 
one was rather the anterior. In Sciwrws maximus the spermatic 
veins had the same symmetry and posterior origin. 
