450 
KAMAKICHI KISHINOUYE : 
in association witli small bonitos. 
This species feeds, S3 far as I know, on small fishes only ;—one specimen 
contained two mackerels in its stomach, the second specimen fourteen examples 
of Stolephorns glacilis, and the third three half-beaks and some anchovies. 
On December 17th, 1918, one of this species was found dead on the 
beach near the mouth of Gönokawa, the largest river in Shimane-ken, 
probably scared by killer-whales or some other ferocious enemies. 
Family KATSUWONIDAE Kishinouye. 
Ivatsuwocicfae, Kishinouye, 1917. 
Body plump, rounded in cross-section, and naked outside of the corselet. 
Lateral line without a marked undulation above the pectoral fin. First 
dorsal very high at the anterior end, becoming suddenly low behind. Second 
dorsal remarkably lower than the first dorsal, and the anal and second dorsal 
are smaller than the ventrals. Pectorals very short and triangular. In this 
family the haemal canal is closed behind the middle of the precaudal region. 
Dentition weak, generally only one row of small teeth in both jaws. When 
teeth are found in other bones, they are arranged in one row only, never 
more. On the roof of the mouth-cavity no dentigerous calcareous plates. 
Tongue smooth with a ridge on each lateral side. No air-bladder. Pyloric 
coeca minute, numerous, uniform in size, and developed on the terminal branches 
of pyloric tubes, arrangea on both sides of the duodenum. The loose and 
thick membrane surrounding the stomach in the Thunnidae is not found in this 
family. Three lobes of the liver unequal, and generally the right lobe is much 
elongated, except in the genus Katsuwonus. Intestine very short, without a loop. 
Rectum is nearly the same in length or a little longer than the remaining part 
of the intestine. The longitudinal folds of the internal layer of the duodenum 
extend to the straight small intestine, just to the beginning of the rectum. 
The circulatory system which is related to the formation of the dark red 
portion of the lateral muscle, differ more or less from that of the Thunnidae. 
In the present family the cutaneous blood-vessels are also two in number, on each 
side of the lateral median line ; but the hypaxial vein is divided to renal portals, 
and the hypaxial artery passes through the kidneys, taking a slight downward 
course, and runs backward anterior to and above the series of the ribs. Except 
