508 MR. F, E. BEDDARD ON THE [ Apr. 27, 
there are in fact two renals, of which the lower is the larger; the 
two join before entering the substance of the kidney and may be 
also said to rejoin before entering the left half of the postcaval 
vein. The diameter of the lower renal is greater than that of the 
posteaval into which it flows. The left suprarenal vessel just 
Text-fig. 136. 
Postcaval vein and its branches in Centetes ecaudatus (A) and 
Lysiurus unicinctus (B). 
J. Junction between two postcave in Centetes. 
joins the upper renal vein before the latter joinsits fellows. From 
the lower renal vein two veins arise, of which the outer is the 
spermatic ; it soon divides into two trunks, but just before this 
