446 KAJIAKICHI KKHENOITE: 



Neothunnus macropterus (Sc^ilegel). 



Kihfita or kiwada, gesunaga, hasliibi, hatäu, liirenaga, itxishibi, 



kioliii-e, kiruedi (immature). 



Figs. 13, 19, 23, 45, 51. 



Thynnvs mna-opteiiis, Schlegel, Fauna Jajjon, Poiss. 1)8, Tab. 51 ; Day, FLsb. lodia, 253, 



1802. 

 Orcynus macn-npteriis, Kitabara, .Journ. Fish. Bur. VI, 2, PI. 2, Fig. 3, 1897. 

 Gemio marroptenis, Jordan <fc Stale, Bull Bur. Fisb. XXV, 228, 1!)06. 

 Tliunmis inacroptei-^is. Kisl inouye, Sui. Gak. Ho, I, 19, PI. 1, Fig. 12, 1915. 



D. 13, 14, 9. A. 14-15, 8-9.' Gill-rakers 9 + 21. Scales ca. 270. 



Body fusiform, elongated, bead small, and the caudal portion long. 

 Scales minute. Pectorals long, pass beyond the origin of the second dorsal, 

 their dorsal and ventral outlines are nearly jDarallel to each other, and are 

 connected by a short obhque side near the distal end. The second doi-s.il and 

 the anal are much elongated, especially in a variety named itoshil.)i or 

 gesunaga, the tips of these fins are whitish and reach to the base of the 

 caudal. So far as I have examined there is no marked diflerence in anatomical 

 stiTicture between the long finned variety and the ordiuaiy form, except in 

 the leng-th of the second dorsal and anal fins. 



No venules on the sm-face of the Hver, the left lolje of which is sometimes 

 divided into two, and the right lote is longer than the other. Pyloric coeca as a 

 mass is shorter than the stomack Intestine rather short, the third tend 

 scarcely reaching the middle l>etweeu the first and the second. The rectum 

 is also short. Aii-bladder naiTow and long not di-vided at the anterior end. 

 Thick strong connective tissue protects the venti-al ijai-t of the air-bladder. 



Venules to the cutaneous vein are arranged in one row on the side 

 towards tlie lateral median hue. These venules run over the external side 

 of the cutaneous artery, after uniting many fine venules. Arterioles from 

 the cutaneous aiiery are arranged in one or two alternate rows from the 

 side near the lateral median line. Cutaneous blood-vessels are found at the 

 surfiice of the lateral muscle tehiud the origin of the first dorsal. A cutaneous 

 vein on each side of the body jwurs separately to the Cuvieriau duct of the 

 respective side, or is imited to the cardinal vein below the ninth vertebra, 

 and in the kidneys. The cardinal vein joins the right Cuvierian duct. In 

 the haemal canal the cardinal vein is united with a plexus of short transverse 



