146 PROF. W. N. PARKER ON THE LEFT PosTerror [| Mar. 19, 
the corresponding precaval, while posteriorly it opens into the 
postcaval just at the anterior border of the kidneys, sending an 
anastomosing branch to the renal portal. Professor Howes informs 
me that he has since come across another Frog in which a similar 
arrangement occurred, except that the azygos here entered the 
subclavian instead of the precaval. 
A week or two ago, while examining a number of specimens of 
Bie: i 
The venous system of an adult male Frog (Rana temporaria), in which the left 
posterior cardinal vein persisted, and the postcaval was absent. From 
the ventral aspect, x 2. 
ed, left cardinal vein; h.v, hepatic veins; %, kidney; 7, liver; pr.c, pre- 
caval ; 7.cd, vessel formed by the union of the posterior part of the two 
cardinals, and which normally gives rise to the inter-renal portion of the 
posteaval; 7p, renal-portal vein; 7.v, revehent renal veins; sp, sper- 
matic veins; s.v, sinus venosus; w7, ureter; v.s, vesicula seminalis, 
Rana temporaria during a class demonstration, I found that in one of 
them (a male) the embryonic state of the veins was retained to a 
still greater extent than in the cases quoted above (see fig.1). A large 
vein (cd), having similar relations to that described and figured by 
