448 
KAMAKICHI KISHINOUYE: 
more than 7 m in lengsh, and ca 200 kg in weight, nex in size to our common 
tunny, etc. The variety called gesunaga is said to be shyer than the ordinary 
form, not easily biting hooks, though it swims very near by and often t niches 
them. The longer-finned variety is said to be plentiful in autumn. 
The flesh is beautifully pinkish, firm, and its taste is excellent. Mostly 
consumed fresh, lieing much esteemed for “ sashimi ”. Many immature fishes 
are used for making “ fushi ” by smoking and drying after boiling in water. 
They feed on flying fish, coffer-fish, some deep-sea fish, calamarie3, pteropods, 
lieteropods, Hyperiua amphipods, Squillas larvae, and immature Squilla, mega- 
lopas of crabs, etc. 
The spawning season of Neothunnus macropterus is not yet known. Some 
specimens examined in autumn at Kyushyu are said to have contained large 
ovaries. 
This species is allied to Thynnus cdbacora Lowe, so far as its external 
characters are concerned, so that Günther and Cunningham consider the 
former to be identical with the latter ; but as in the case of the other exotic 
species the anatomy of Thunnvs albcicora lias been little studied, therefore it 
is impossible to determine the question. 
Neothunnus rar us (Kishinouye). 
Kosliinaga, bintsuke, hashibi, seiyoshibi, shiroshibi, tongari. 
Figs. 24, 48, 64. 
Thunnus rarus, Kishinouye, Sui. Gak. Ho, I, 23, PI. 1, Fig. 13, 1915. 
D. 13, 14, 9. A. 14, 8. Gill-rakers 5-6 + 15-17. Scales ca. 220. 
Body broad, head and eye3 comparatively small, snout short, and caudal 
portion elongated. Scales minute. Curve of the lateral line above the pectoral 
very gentle. The number of gill-rakers is minimum in our Plecostean fishes. 
Pectorals broad, lanceolate, scarcely reaching to the vertical from the last 
but one spine of the first dorsal. Second dorsal and the anal are a little 
higher than the first dorsal. 
c 
Bight lobe of the liver longest. Air-bladder absent. This is the only 
kind of the Japanese tunnies, which lacks it. The posterior end of the 
kidneys is very narrow and extends nearly to the segment of the fifteenth 
vertebra. Ureters are united to a common duct under the 12th vertebra. 
