514 MR. F. E. BEDDARD ON THE [Apr. 27, 
posterior branch ran in the same straight line as the anterior 
branch and divided into two principal trunks, of which the 
anterior supplies the ovary itself and the hinder the oviduct. 
In two other examples I found this branch just as plain. It is 
remarkable that it was at least not so obvious on the left side ; 
indeed I made no notes at all as to its occurrence on that side of 
the body. It is possible that the restriction to, or at least the 
more marked development upon, the right side of the body is con- 
nected with the persistence of the right azygos vein only (as a 
rule) in this Subungulate. 
McClure has discovered * the interesting fact that in Zragulus 
meminna the posteaval is divided postrenally as in Armadillos &e., 
and I have been able to confirm f him by the examination of three 
individuals. Since the publication of my note referred to I 
haye examined two other examples of Zragulus meminna which 
presented an identical disposition of the vena cava posterior. 
Furthermore, I have still more recently dissected an example of 
Tragulus stanleyanus in which the same bifurcation of the post- 
caval occurred, and in the same way the genital veins arose sym- 
metrically from the region of the postcaval. 
The Lemuroidea.—In the course of some notes upon the 
anatomy of Chiromys madagascariensis = I have pointed out that 
within the group of Lemurs considerable variations exist in the 
tributaries of the postcaval vein. It seems to me to be evident 
—though I did not point it out in the memoir to which I have 
referred—that Microcebus has retained the Marsupial and Kdentate 
character in its venous system, in that the spermatic veins arose 
more or less symmetrically some way down the postcaval and that 
both were connected with the renal veins by a slender vessel on 
each side, which seems to me to represent the anterior spermatic 
vein of Marsupials, but in this Lemur (icrocebus) mm the course 
of disappearance. On the other hand, in Chiromys (of which 
Lemur I reported upon two examples in the paper referred to and 
have here to report upon a third $) only the posterior spermatic 
veins in the male at any rate are left. 
A study of the posteaval and its branches in Lemur catia shows 
that this region of the venous system is like that of MZicrocebus. 
The two renals are single on both sides, but asymmetrical in the 
usual way. Into each renal flows on the posterior side an anterior 
parietal vessel, which corresponds, as I believe, to one of the two 
veins on each side which accompany the ureter in the Marsupials. 
On the left side there was also a small vein like that in crocebus 
closely accompanying the posteaval and flowing into it above close 
to its junction with the left renal. Posteriorly, I think, but am 
not quite certain, it joins the spermatic of its side. In this case 
the likeness to Mierocebus is quite close. The two principal and 
* “The Postcava of an Adult Indian Chevrotain,” Anat. Anz. xxix. 1906, p. 375. 
+ Amer. Journ. Anat. vol. vii. 1907, p. 111. 
+ P.Z.S. 1908, p. 694. 
§ Vide infra, p. 521. 
