442 
KAMAKICHI KLSeiXOUYE : 
This species seems to descend to a depth of about forty metres below the 
surface of the water. 
Genus Parathunnus gen. nov. 
Cutaneous blood-vessels are found from the myotome of the seventh vertebra 
backward. The posterior cardinal vein does not communicate with the 
Ouvierian duct directly. At the margin of the exterior surface of the liver a 
few short venules are found. On the internal surface of the liver, conical 
masses of plexus of venules only are found, arteries not being divided in the 
masses. The right side of the stomach receives an artery from the right dorsal 
branch of the coeliaco-mesenteric artery. 
Parathunnus mebachi (Kishineuye). 
Mebachi, darumashibi, hirashibi, mebuto. 
Figs. 4, 22, 47, 49. 
Orcynus sibi, Kitahara, Journ. Fish. Bur. VI, 1, PI. 1, Fig. 2, 1897. 
Thunnus mebachi Kishiuouye, Sui. Gak. Ho, I, 19, PL 1, Fig. 11, 1915. 
D. 14-15, 13, 9. A. 13, 9. Gill-rakers 8-10 + 18. Scales ca. 190. 
Body very broad, the caudal portion short, and the head and eyes large. 
The dorsal outline of the body is much curved ; but the ventral outline is much 
more curved. Scales in the corselet very large. Length of the head nearly 
equal to the height of the body in young specimens, but it becomes a little 
shorter in old individuals. The anus is nearly in the middle between the 
snout and the end of the caudal fin. Scales large ca. 190 in the lateral fine, 
which has a gentle, wavelike elevation above the pectorals. Pectorals are 
long, gradually pointing towards the distal end. In large specimens they 
scarcely pass beyond the origin of the second dorsal, but in small 
specimens ca. 1 m in length, they reach the first dorsal finlet, and the vertical 
passing through the middle of the anal. Second dorsal and anal are only a 
little higher than the first dorsal, and they are comparatively narrow and 
falciform. The caudal fin is widely expanded, wider than the height of the 
body. Posterior portion of the first dorsal has the convex outline generally. 
Air-bladder well developed. It is divided into two heads at the anterior 
end, which lie on both sides of the dorsal aorta and between the pharyngeal 
