44 
Cincinnati Society of Natural History. 
4. The connection of the caudal vein with the posterior 
cardinals. 
5. The presence of a well developed valvular portal heart. 
. auricle. 
alimentary canal. 
. ventral aorta. 
. anterior dorsal aorta. 
. posterior dorsal aorta. 
. bulbus aorte. 
. right common carotid. 
. left common carotid. 
. portal heart. 
. intestine. 
. liver. 
. anterior lobe of the liver. 
. posterior lobe of the liver. 
. mesentery. 
sinus venosus. 
. lobules of testis. 
. ventricle. 
. anterior hepatic artery. 
. left anterior cardinal vein. 
. right 
anterior cardinal 
vein. 
. auriculo-ventricular 
valves. 
. aortic valves. 
afferent branchial arteries. 
. anterior portal vein. 
. cystic vein. 
. ‘*club-muscle.’’ 
- ‘‘club-muscle’’ branches. 
. capillary network. 
. connecting vessel. 
. anterior branch 
of the 
common portal. 
. posterior branch of the 
common portal. 
. coeliac artery. 
. caudal vessel. 
. common portal vein. 
. dermal branches. 
dca, 
ep, 
Cf. OF 
ext. car, 
Len, 
iO, e 
Pe, 
St, 
EP, - 
8 
ha, . 
pre: 
Z, 
CG: 
int. Car, 
IY, 
lbr, 
mC, 
mur, . 
mn, 
mw, 
my, 
mes, 
ntc, 
EXPLANATION OF LETTERING USED IN FIGURES. 
deep anterior cardinal. 
epithelium of the gill 
cavity. 
efferent branchial artery. 
external carotid artery. 
. genital branches. 
. gall cyst. 
. external gill passage. 
. internal gill passage. 
. Cavity of the gill pouch. 
. gill pouch. 
. anterior hepatic vein. 
. posterior hepatic vein. 
. inner (visceral) layer of 
the pericardium. 
‘intercostal ’’ vessel. 
internal carotid artery. 
. inferior jugular vein. 
. lateral branch. 
mesocardium. 
. right mesonephros. 
. left mesonephros. 
.muscular wall of gill 
pouch. 
- myotomes. 
. mesenteric arteries. 
. notochord. 
. outer (parietal) layer of 
the pericardium. 
. oesophago-cutaneous duct 
. right posterior cardinal 
vein. 
left posterior cardinal vein 
. common posteriorcardinal 
. pharyngeal branches. 
right pronephros. 
. left pronephros. 
. peritoneal cavity. 
. pericardio-peritoneal fora- 
men, 
