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KAMAKICHI KISHINOUYE: 
lias the front margin nearly vertical. In the Katsuwonidæ the lower anterior 
corner of the lamellar portion is well produced, except in the genus Euthynnus. 
The supraclavicle is a small elliptical bone, more or less pointed at the 
anterior end, and thickened at the lower margin. At the anterior part this 
bone fits between the posterior process and the lamellar portion of the post¬ 
temporal. The principal part of the supraclavicle rest3 on the dorsal extended 
part of the clavicle. On the inner side of the neck of the supraclavicle a 
strong ligament, which I shall call the clavicular ligament, is inserted with a 
broad attachment. The ligament connects the axial skeleton with the pectoral 
girdle. In the Scombridæ the anterior neck and the exterior vascular groove 
are not conspicuous ; but the inner ventral ridge is well developed. In the 
Cybiidæ the neck is not distinct, except in Sarda, neither is the inner ventral 
ridge tvell developed. The vascular groove is faint and found in the anterior 
median part. In the Thunnidæ the neck and the inner ventral ridge are very 
conspicuous. The shallow, vascular groove is found at the posterior lower 
margin. In the Katsuwonidæ the bone is nearly the same as in the preceding 
family ; the vascular groove is deep and conspicuous. In Euthynnus and 
Auxis, moreover, a large tendon is inserted just behind the attachment of the 
clavicular ligament. The tendon is the terminus of a hypaxial small cone of 
some anterior myotomes, about five in number. Thus the supraclavicle 
is connected to the axial skeleton with a strong straight, transverse ligament, 
and indirectly with a hypaxial, longitudinal tendon. 
The clavicle is a large curved bone, broad at the dorsal end, thin and 
pointed at the ventral end. The main stem consists of two wings, the exterior and 
interior, which meet at the anterior margin. At the dorsal anterior comer there is 
a pointed process. In the Scombridæ the exterior wing is nearly vertical to the 
interior wing at the anterior part, and the lower anterior extremity is turned more 
or less externally. In the Cybiidæ the exterior wing is wide, and is bent 
backward with an acute angle, and the posterior margin of the exterior wing 
is parallel to the interior wing. The anterior margin of the bone is mostly 
rounded. In the Thunnidæ the exterior and interior wings meet in an angle 
approaching a right angle, and the exterior wing is not well developed at the 
lower half. The exterior wing is produced interiorly beyond the anterior 
margin of the bone, at the dorsal part, with the same inclination. In the 
