330 



KAMAKICHI KISHINOUTE: 



Scomber japonicus 



Hastrelliger chrysoTonus 



Cybhwi commerson 



Sarda (»■ientalix 



Gymnosarja mida 



Thunmis orientalis EuViynnus yaito 



Fig. G. Dorsal, lateral, and ventral views of tlie basibranoliials. 



small calcareous pieces on these arches. In the Scombridse the upper, anterior 

 paai of the basibranchial ridge is almost naked, being protected with a few 

 calcareous dentigerous pieces. The villous teeth on the pharyngeal bones are 

 nearly equal to those on the branchial arches, contrasting to the coarser teeth 

 on the foi-mer in the other scombroid fishes. In the Cjbiidse dentigerous pieces 

 are arranged in two rows, meeting at the dorsal median line of the branchial 

 arch. In the Plecostei two rows of dentigerous pieces meet near the internal 

 comer of the branchial arch. 



The hypobranchials are short, joined to the sides of the second and tliii'd 

 basibranchials, and are gi'ooved on the outer or ventral side. Thoy are not 

 found in the fourth arch. 



