334 KAMAKICm KISHINOUYE : 



dorsal posterior base of the pectoral fin. The upper unterior piece is lamellar, 

 more or less kidney-shaped in outline, and is bent near the ventral posterior 

 end. Its ventral margin concave, and the doi-sal convex. The lower posterior 

 piece is rather broad and lamellar at the anterior part, generally ■Nnth an 

 ascending pointed process, and a long stj'liform process Ijehind. This lower 

 piece (fig. H) has more characteristics in different forms of fishes than the 

 upper. In the Seombridae the lamelliform portion is comparatively large, and 

 the styliform process suddenly narrows and bends upward. In the Cybii- 

 dae the styliform process is rather broad and straight, while the lamelli- 

 form portion is rather small and flattened. In the Plecostei the lamelliform 

 poition makes an angle with the styliform. In the Thuuuidae the angle or 

 the bent portion is raised and thick, and the stylifoi'm portion very short. In 

 the Katsuwonidae the styliform portion seems as if joined to the lamelliform 

 portion, at the inner side near the ventral margin. The styliform jwrtion 

 is long. 



Pelvic Girdle. 



The so-called pelvic girdle is a pair of bones united at the median line, 

 imbedded free in the ventral part of the abdominal wall. Each lione consists 

 of three parts : — anterior, external portion ; anterior, internal portion ; and 

 posterior styliform portion. The first named portion is largest, and serves for 

 the attachment of muscles. The last two portions meet, with roughened sur- 

 faces, their fellows of the other side. The portion of the pelvic gii-dle where 

 the ventral fins articulate is thick and transverse. The anterior external por- 

 tion is most well developed and most complicated. In the posterior half of 

 the portion we distinguish three wings; — external, internal, and ventral. 



In the Seombridae the i^elvic girdle is quite small. The anterior external 

 portion is elongated and bent upward, with its external and internal wings 

 meeting in one plane. The venti-al wing is short and small. The anterior 

 internal portion is thin, slender, and has nearly the same length as the ventral 

 wing. The posterior styliform process is also very short. In the Cybiidae the 

 anterior external portion is long and straight, more or less vertical at the 

 anterior part, and the cross-section of the posterior jjart is tiiradiate. The 

 anterior internal portion is short and slender, about one-third of the external 



