434 KAMAKICHI KLSHINOriE: 



the stomach, spleen, and iutestiue. The hepatic portal veins running along 

 these arteries are also subdivided into plexus before entering the liver. The 

 oesophageal ai-tery is not well developed, and the coeliac arteries are branchel 

 from hepatic arteries. Cutaneous arteries branch from the dorsal aorta below 

 the fifth vertebra and just 1 ehind the pharjTigeal muscles. Arterial and 

 venous plexus on the axial side of the hver. 



Hound the spots of emergence of the hepatic veins the liver consists uf 

 only, a thm sheet of venules the substance of the liver not being fotmd in 

 these sjxjts. Thus the Hver is thickest midway between the root of the 

 hepatic veins and the attenuated mai'gin of the liver. Vascular plexus on the 

 axial side of the hver are also situated at the thin portions, and are siurounded 

 by thick masses of the Kver. Boof of the abdominal cavity is convex, at tlie 

 anterior pjut. External wall of the air-bladder is uniformly thin. Kidneys 

 ring-shaped. 



Key to the Japanese species of the genus Thunrius 



Pectorals very long, reaching to the second dorsal finlet. markings in the belly, 



when present, longitudinally anastomosing Th. genno. 



Pectorals not reaching to the vertical o£ the origin of the secjnd d->rsal, 



markings in the belly transverse, and constantly present Th. Orientalin. 



Thunnus germo (Lace^iede). 



Tomboshibi, binchoh, binnaga, kantaro. 



Figs. 2Ö, 46, 52. 



Scomber germo, Lacepede, Hist. Nat. Poiss. II. 598, III, 1, 1802. 



Thynnus pacificus. Cut. & Val, Hist Nat. Poiss. VIII, 133, 1831 ; Günther, Cat. Brit. 



Mus. II, 36P, 1860. 

 Germo get-mo, Jordan & Scale, Bull. Bur. Fish. XXV. 175, 1S)D5. 

 r/i«nn«.s- alalumia ?. Kishinouye, Sui. Gak. Ho, I, 18, PI. 1, Fig. 10, 1915. 



D. 14, 14, 8. A 14, 8. Gill-rakers 9-| 18-19. Sc.iles ca. 210. 



Body rather slender, head and eyes com^mratively large, caudal portion 

 short. Scales ratlier liu'ge, about 210 in the lateral line. Pectorals sabru; 

 shaped, very long, reaching to the first aruil fiulot. Lower mtirgin 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 firet dorsal. 



Tlie ixxjf of the abdominal cavitv is nemai-kably convex. So the cavit\- is 



