458 K.UIAKICHI KISHIS'OC\'E : 



Eulhynnus yaito, Kishinouye, Sui. Gak. Ho, I, 22. PI. 1, Fig. 15, 1915. 



D. 15-lC, 12-13, 8. A. 13, 7. GiU-rakers 8-10 + 22-24. 



Vomerine teeth present. This character clearly sepai-ates this species from 

 the alHed s^^ecies of the Atlantic, with which it has Ijeen hitherto confounded, 

 as the presence of the vomerine teeth in this sjDecies had l^een overlooked. 

 Vomerine teeth are ari'anged in one row on a longitudinal ridge. Palatine 

 teeth are also on one row only. The upper jaw has 27-30 teeth, while the 

 lower has 24-27. Gill-rakers in this species are fewer in number than in the 

 allied species of the Atlantic. The latter has 11-28. 



The cutaneous artery sends arterioles ft-om the inner and lower side in 

 one row, while the venules t^ the cutaneous vein are arranged in two rows, 

 alternate on the inner side. To the epaxial cutaneous blood vessels both the 

 upper and lower segmentary branches are connected. 



Skull broad, its breadth is contained 11 in its length. The alisphenoid 

 and prootic meet, and form a bridge over the gi'oove of the prootic. Two paire 

 of the auxiliary intermuscular bones are fouml on the doi-sal surface of the 

 exoccipitals, one pair of which is situated just above the foramen of the spinal 

 cord, and the other at the lower end of paired vertical ridges continued from 

 the top of the epiotic. The supraoccipital crest is very broad, and its vertical 

 side meets the fused median ridge of the exoccipitals. In the specimen figured 

 in fig. 58 the caudal vertebrae are very long. 



Back bluish black with many dark oblique bands. Belly silvery with 

 three or more gi-eyish spots below the pectorals. Fins black or gieyish, the 

 ventrals are jjartly black and fi'inged with chalk-white. Ii-is silvery with 

 beautiful reflection. A black s^wt under each eye. 



Found chiefly in the southern part of our empire. The northern hmit of 

 distribution seems to be near Chiba-ken on the Pacific cjast. Lately Mr. K. 

 Nomura sent me a specimen of this species, caught near Tsm-uga, Fukui-keu 

 in October, 1921. This is the first specimen from the Japan Sea. Among 

 specimens of scombroid fishes from the Dutch Indies, kindly sent by Mr. Gobee, 

 I found three immature forms of this species, Imt the southern limit of dis- 

 tribution is not yet determined. 



This species is rather rare, and is not found in schojls. As it approaches 

 the shore, a few examples are sometimes caught in drjig seines and poimd-uets. 



