1922.] “* Renal Portal’ System. 115 
a he PN 
CARD. 


RSPRAV --- 

“LSPRAV RSPRAV- --LLNPRAV 

/ 
A 6 B 
TEXT-FIGURE 5(x 2). The ree left —- cardinal vein in 
the frog, (R. temporaria.) labelled CH. V, ventral as: aepect ; D, dorsal aspect. 
RSPRAV, right small ‘portal ”’ renal ‘aierent vein; LLNPRAYV, left 
large non-portal renal afferent vein. The right ‘enertal ” renal afferent 
vein only measure sera 0-341 mm. in external diameter, while the left non- 
portal renal afferent vein measured 0:852 mm. The external diameter 
of the anterior aden vein measured 0°930 mm. and was therefore 
gee 
GuRE 6, A. Persistent right posterior cardinal vein in a frog 
ala Wosdland; 43). 
Persistent left posterior cardinal vein in a frog 
(after O’Donoghue, 33). 
The difference of calibre of the ‘‘ portal ” vr non-portal renal 
afferent veins is conspicuous. PPC, posterior cardinal vein: 
RLNPRAV, right large non-portal renal afferent vei: : R 
small ‘‘ portal” renal rent vein; RSPRAV, right small adr renal 
por affe 
afferent vein: LLNPRAV, left large non-portal renal afferent vein 
