GENUS AND TEN NEW SPECIES OF JAPANESE FISHES. 



21 



brownish (in the type there occur, besides, in the posterior parts 

 two brownish patches situated one above the other). Pectoral and 

 ventral pale ; caudal slightly dusky and narrowly edged with 

 brown posteriorly. 



Female — reddish yellow, paler beneath, sparsely black- 

 punctate throughout body. Dorsals and aual dusky, outer edge of 

 both slightly darker. Pectoral and ventral pale ; a brownish 

 patch at base of pectoral extending to parts of body above that 

 fin. Caudal dusky, with some indistinct brownish bands, nar- 

 rowly edged with brown posteriorly. 



The species is distinguished from all others of the genus by 

 having interorbital equal in width to diameter of eye, by higher 

 body and rather shorter maxillary and by different markings 

 especially in regard to males. 



Several specimens of the species, both male and female, 

 were collected (probably in freshwater) in Yaëyama, a town in 

 Ishigakishima, Riukiu Islands, by Mr. G. Ogawa in August 

 (year uncertain). In these sexual elements as well as secondary 

 sexual characters were very distinctly developed. The type, a 

 male, is in the University collection with register number 1737. 



MEASUEEMEXTS OF OPHIOCABA GRACILIS. 



Specimen. 

 Sex 



Total length as measured to root of middle 



caudal rays 

 Height of body 

 Length of head 

 Diameter of eye ... 

 Interorbital width ... 

 Lenirth of snout ... 



