1909.] POSTCAVAL VEIN IN MAMMALS, 509 
sends off a branch to the inner vessel which runs along the ureter. 
On the right side the renal vein was quite single. With it are 
connected two veins as on the opposite side; but these as well as 
the renal vein were of less calibre than their fellows on the left. 
I noticed a double lumbar parietal vein on the left side; but 
have no notes concerning a corresponding vein on the right. I 
also observed a caudal plexus in the pelvic region, which is so 
characteristic a feature of the venous system of the genus 
Dasypus. In the large tract of postcaval, which is double, it is 
clear that this species comes nearer to Dasypus setosus than to 
the other species of that genus which have been described. 
I did not find posterior spermatic veins in this Armadillo, and 
am sure that I have not confused such veins with the lumbar 
parietal veins already referred to. 
I have already mentioned in a preliminary note* that the 
venous system of the genus Vatusia is constructed upon the same 
plan as that of the genus Dasypus, instancing the species Vatusia 
kapplert. Of that species I have accurate notes upon the left 
side of the body only. The postcava is double at some little 
distance behind the influx of the renal veins and just in front of 
the origin of the ovarian arteries. The left renal vein is single 
and enters the postcaval behind and not in common with the supra- 
renal of its side, Just before the renal vein reaches the kidney, 
or, to speak more accurately, just after it has left the kidney, it 
gives off a descending branch which fuses with the ovarian 
vein to be described shortly and then bifurcates, one branch going 
to the ovary and the other passing down the ureter. The latter 
is connected with an ascending branch which I did not trace 
so far forwards as the renal vein, but it evidently corresponds to 
the second of two veins which debouch into the renal vein in other 
Armadillos. The ovarian veins are quite symmetrical, and, as in 
Dasypus novemeinctus, as figured by Hochstetter, flow into each 
half of the postcava just after the bifurcation and on a level with 
the emergence of the posterior mesenteric artery. 
Of Tatusia peba I have more elaborate notes. The individual 
which I dissected shows some differences from the specimen of 
Tatusia kappleri just described. ‘The renal veins (see text- 
fig. 135 A, p. 506) are asymmetrical, but the left does not become 
connected with the postcaval a very long way below the right. 
The renal veins are not, however, single on each side as in Tatusia 
kappleri (as to right side); there are two veins on each side, of 
which the more anterior is in both cases the larger. From the 
lower of the two renal veins of each side depend two veins which 
are again fairly symmetrical on both sides of the body. These 
are shown in the figure (text-fig. 135 A), and they will be seen 
to join and rejoin in a plexus-like fashion. The outer branch is 
ovarian and the two inner follow the ureter. I do not think 
that there are ovarian veins connected with these and with 
* Amer, Journ. Anat. 1907, p. 111. 
