324 
FISHES 
CHAP. 
the corresponding vein from the caudal myotomes; from the 
common trunk numerous branches enter the kidney. 
Fig. 191.—Venous system of Meoceratodus. 
a.ab, Anterior abdominal ; af.7.v, afferent 
renal veins ; 6.v, brachial ; ¢c.d, Cuvierian 
duct ; c.v, caudal ; h.p.v, hepatic portal ; 
hv, hepatic ; 7.c.v, intercostal veins ; 7.7, 
inferior jugular ; 2.v, iliac ; 7.v.c, inferior 
vena cava or postcaval; k, kidney ; J, 
liver ; /.a, left auricle ; /.p.c, left posterior 
lateral cutaneous vein ; 
pt.v, vein from postcloacal myotomes ; 
cardinal; J.v, 
p.v, pulmonary vein; pv.v, pelvic ; 7.a, 
right auricle ; 7p.v, renal portal; s.c.v, 
subscapular ; s.7, 
».v, right vertebral vein. 
Spencer.) 
superior jugular or 
anterior cardinal ; ¢, testis ; v, ventricle ; 
(After Baldwin 
In the derivation of renal 
portal veins from each of the 
two veins into which the caudal 
vein divides, Neoceratodus ap- 
proaches the Elasmobranchs. 
On the other hand, the utilisa- 
tion of ordinary segmental veins 
from the caudal and pre-caudal 
myotomes, some of which 
directly enter the kidney, is a 
feature which has already been 
remarked in some Teleosts; 
while the formation of a renal 
portal affluent by a branch of 
the femoral vein is an even 
more striking Amphibian char- 
acteristic. 
The efferent renal veins‘ 
join the root of the left pos- 
terior cardinal and the adjacent 
portion of the caudal vein. 
Of the two great venous 
trunks into which the caudal 
vein divides, the right is much 
the larger and behaves some- 
what differently to the left. 
The former (i.v.c) passes for- 
wards in relation with the right 
kidney, receiving in its course 
the spermatic or ovarian veins 
from the gonad of its side, and 
then traverses the liver, finally 
opening into the median portion 
of the sinus venosus, between 
the orifices of the two hepatic 
veins. The left branch of the 
caudal vein (/.p.c) also passes forwards in relation with the left 
+ Baldwin Spencer, op. cit, pp. 24, 30-31. 
Not represented in Fig. 191. 
