148 PROF. W. N. PARKER ON THE LEFT PosTeRIOR [Mar. 19, 
valuable suggestions to me by letter on this subject, for he could 
not believe that the two so-called “ venze cave posteriores”’ were 
Fig. 2. 
SeZ, 
—L.ed 
i o i 
! NA ry 
il d 
(ORES Nie 
Nn a SRA 
Diagram of the chief veins of Protopterus wnnectens. From the ventral aspect. 
(N.B.—The veins from the body-walls and generative organs are omitted.) 
c.v, caudal vein; 4.v, hepatic veins; %, kidney; /.cd, left cardinal; /7, liver ; 
pr.c, precaval ; pt.c1, hepatic portion of postcaval; pt.c”, renal portion 
of posteaval ; p.v, pelvic vein ; 7.p, renal portal vein ; s.cl, subclavian. 
really the cardinals. Although my observations on Protopterus 
do not point to a paired origin of the postcaval, as indicated by 
