3G2 



KAMAKICHI KISHINOUYE : 



Fig. N. External yiew of the liver. 1. Scomber japonicus; 2, Cyhium jiiphon'mm; 

 3. Sarda orientcdis ; i, Gymnosarda nuda ; 5, Thunnus orientalis ; 6, Parathnnus mebachi ; 

 7, Keothunnus macropterus ; 8, Katsuwonus pdamis ; 9, Euthynrms yaiio ; 10, Atixis maru. 



In the Cybiidae as well as in Scombridae the surface and the outline of 

 the liver are smooth. In the Thunnidae the three lobes of the liver are sub- 

 equal, but in the Katsuwonidae the lobes of the liver are unequal in size, the 

 right lobe being best developed, and the left lobe is often not well defined. 

 In Tliunnus (fig. 3) the external surface of the hver is marked with fine venules 

 running very close together, and at the anterior middle portion of the liver, 

 near the spots of emergence of hepatic veins, the liver is very thin, being 

 comjxsed of hepatic venules only. Moreover the liver is divided into many 

 inegulai" lobules at the margin as well as at the internal or axial side, where 



