434 
KAMAKICHI KLSHINOÜYE: 
the stomach, spleen, and intestine. The hepatic portal veins running along 
these arteries are also subdivided into plexus before entering the liver. The 
oesophageal artery is not well developed, and the coeliac arteries are branched 
from hepatic arteries. Cutaneous arteries branch from the dorsal aorta below 
the fifth vertebra and just Lehind the pharyngeal muscles. Arterial and 
venous plexus on the axial side of the liver. 
Hound the spots of emergence of the hepatic veins the liver consists of 
only, a tliin sheet of venules the substance of the liver not being found in 
these spots. Thus the liver is thickest midway between the root of the 
hepatic veins and the attenuated margin of the liver. Vascular plexus on the 
axial side of the liver are also situated at the tliin portions, and are surrounded 
by thick masses of the fiver. Roof of the abdominal cavity is convex, at the 
anterior part. External wall of the air-bladder is uniformly thin. Kidneys 
ring-shaped. 
Key lo the Japanese species of the genus Thunnus 
Pectorals very long, reaching to the second dorsal finlet, markings in the belly, 
when present, longitudinally anastomosing. Th. germo. 
Pectorals not reaching to the vertical of the origin of the second dorsal, 
markings in the belly transverse, and constantly present. Th. orientalis. 
Thunnus germo (Lacépède). 
Tomboshibi, binclioh, binnaga, kantaro. 
Figs. 20, 46, 52. 
Scomber germo, Lacépède, Hist. Nat. Poiss. II, 598, III, 1, 1802. 
Thymus pacificus, Cuv. & Val, Hist. Nat. Poiss. VIII, 133, 1831 ; Günther, Cat. Brit. 
Mus. II, 366, 1860. 
Germo germo, Jordan & Seale, Bull. Bur. Pish. NXV, 175, 1905. 
Thunnus alalunga ?, Kishinouye, Sui. Gak. Ho, I, 18, PI. 1, Fig. 10, 1915. 
D. 14, 14, 8. A 14, 8. Gill-rakers 9 + 18-19. Settles ca. 210. 
Body rather slender, head and eyes comparatively large, caudal portiou 
short. Scales rather large, about 210 in the lateral fine. Pectorals sabre 
shaped, veiy long, reaching to the first anal finlet. Lower margin of these 
fins is a little concave at the proximal part. Height of the second dorsal is 
equal to or a little shorter than that of the first dorsal. 
The roof of the abdominal cavity is remarkably convex. So the cavity is 
