460 
KAMAKICHI KISHINOUYE 
species by the presence of about three longitudinal dark lines or rather 
bands in the naked portion above the lateral line. One row of teeth on the 
vomer and palatines as in Euthynnus yaito. In the new species the head is 
larger than in the other species. The specimen examined is 48 cm in the 
total length. In the thoracic part there are some spots or rather very short 
bands. Caudal portion very slender and short. 
Genus Au sis Cuvier. 
Auxis Cuvier, Regne Anim. II, 119, 1829. 
Body rounded in cross-section, fusiform, and more elongated than in Ka- 
suioonus and Euthynnus. Caudal portion remarkably short, while the precau- 
v 
dal portion is very long. Snout short, mouth small. Teeth in both jaws only. 
Fins small, especially the second dorsal, anal, and caudal. Posterior portion of 
the first dorsal has disappeared, and the fiu is nearly triangular in shape, 
and is not continuous to the second dorsal. In the median prolongation of the 
corselet, we find no indentation at the ventral margin behind the pectorals. Later¬ 
al line slightly curved with small undulations. Tongue flat, smooth, and silvery. 
Basioccipital together with the parasphenoid form paired horn-like process¬ 
es behind to support the first vertebra above. Exoccipitals fused to one piece 
of bone, with a prominent dorsal median crest, just below the supraoccipital 
crest, thus affording a strong hold for the insertion of the lateral muscles. 
Deep transverse depression along the suture bet ween the prootic and alisphe- 
noid, corresponding to the ventral groove in the optic lobe of the brain. At the 
anterior border of the depression the alisphenoid is produced to a shelf to 
partly cover the depression. Pterotic process long and broad horizontally. The 
sphenotic does not appear in the dorsal side of the skull. Antero-superior 
corner of the subopercle produced. One pair of auxiliary intermuscular bones 
on the coalesced exoccipitals, just above the foramen for the spinal cord. Some 
intermuscular bones behind that of the 8th vertebra are divided into two por¬ 
tions and are connected by a ligament. 
The first vertebra is not closely coalesced to the skull, and the upper 
posterior zygapophyses are long and large for the attachment of the clavicular 
ligament. The neural process of the first vertebra is weak and small. In the 
