442 KÄMAKICHI KlSHINOtTE : 



This species seems to descend to a depth of about hrtj metises 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 

 Cuvieiian duct directly. At the margin of the exterior surface of the liver a 

 few short venules are fuuud. On the internal surface of the liver, conic.d 

 masses of plexus of venules only are found, arteries not being divided in the 

 masses. The right side of the stomach receives an aiteiy from the right dorsal 

 branch of the coeHaco-mesenteric artery. 



Parathunnus mebachi (Kisliiuouye). 



Mebachi, daramasliil )i, hirasliil.«, mebutj. 



Figs. 4, 22, 47, 49. 



Orcymis stbl, Kitahara, Journ. Fish. Biir. VI, 1, PI. 1, Fig. 2, 1897. 

 Thunnus mebachi Kishiuouye, Sui. Gak. Ho, I, 19, PI. 1, Fig. 11, 19i5. 



D. 14-15, 13, 9. A. 13, 9. Gill-mkers 8-10 + 18. Scales ca. 190. 



Body very bivjad, the caudal portion short, and the head and eyes lai'ge. 

 The dorsal outline of the body is much curved ; but the venti'al outline is much 

 more cm-ved. Scales in the coi-selet very large. Length of the head nearly 

 equal to the height of the body in young specimens, but it becomes a httle 

 shorter in old indi%'iduals. The anus is nearly in the middle lietween the 

 snout and the end of the caudal fin. Scales lai-ge ca. 190 in the lateral line, 

 which lias a gentle, wavelike elevation above the pectorals. Pectorals are 

 long, gradually pointing towards the distal end. In lai'ge sixK-imeus they 

 scarcely pass beyond the origin of the second dorsal, luit in small 

 sjxK'imens ca. 1 m in length, they reach the first dorsal finlet, and the vertical 

 passing tlu-ough 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 developeil. It is divided into two heads at tlie auteiior 

 end, which lie on both sides of the dorsal aorta and between the phalangeal 



