326 
; FISHES 
CHAP. 
- 
[ 
[ 
[ 
f [pew 
[ 
[ 
[ 
i 
[ 
, 
, 
p---- PU 
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. 
. 
> OW Ur 
, 
, 
Fic. 192.— Venous system of Proto- 
pterus. a, Auricle; a.c, anterior 
cardinal ; an.v, anastomotic veins ; 
c, intestine; fv, femoral or iliac 
vein; g.b, gall-bladder ; h.p.v, hep- 
atic portal vein; 7.7.v, inferior 
jugular; ov.v, ovarian veins; p, 
pericardium ; p.c.v, left posterior 
cardinal ; p.v’, parietal or segmental 
veins ; s, stomach; sb.v, subclavian. 
Other reference letters as in Fig. 
191. (From Newton Parker.) 
limb each femoral vein divides 
into two branches; one of these 
forms a renal portal vein as previ- 
ously described; the other, which 
may rightly be termed a_ pelvic 
vein (pv.v), unites with its fellow 
to form a median anterior ab- 
dominal vein (a.ab). Pursuing its 
course forwards in the ventral ab- 
dominal wall, the vein eventually 
reaches the heart and opens into 
the sinus venosus. The direct 
connexion of the anterior abdo- 
minal vein with the heart is yet 
another example of the retention 
in the adult Neoceratodus of a 
transitory embryonic feature in 
the developing Amphibian.’ 
As in other Fishes, the blood 
from the head is conveyed to the 
Cuvierian ducts by an anterior 
cardinal and an inferior jugular 
on each side. There are no 
lateral veins, the blood from the 
pelvic fins flowing into the renal 
portal system or into the anterior 
abdominal vein, and that from 
the pectoral fin through  sub- 
scapular and brachial veins into 
the Cuvierian ducts. Lateral 
cutaneous veins are, however, 
present ; and, as in Elasmobranchs 
(e.g. Dustelus antarcticus), anas- 
tomose anteriorly with the sub- 
scapular vein and behind with the 
caudal vein. 
1 As an abnormality the adult Frog may 
retain the embryonic connexion of the 
right anterior abdominal vein with the 
heart (Buller, Journ. Anat. “and Phys. iii. 
1896, p. 211). 
