442 Dr. A. Giinther on new Fishes from Japan. 



Pleuronectes yohohamcB. 

 D. 68-72. A. 52. 



The height of the body is contained twice and one sixth 

 in the total length (without caudal) ; the lengtii of the 

 head four times. Snout shorter than the eje, the dia- 

 meter of which is one fifth of the length of the head; 

 lower jaw prominent ; maxillary as long as the eye ; the 

 upper jaw with a series of fifteen truncated teeth on the 

 blind side, none on the other ; eyes separated by a very 

 narrow space covered with rudimentary scales. Scales 

 small, cycloid, imbricate, larger about the lateral line than 

 elsewhere ; the anterior curve of the lateral line is strong in 

 an adult specimen, but much more open in a young one ; 

 its width equfJs the length of the pectoral ; pectoral more 

 than half as long as the head ; ventrals entirely separate ; 

 fin-rays smooth ; the dorsal commences immediately behind 

 the front margin of the orbit. The free portion of the tail 

 much higher than long. Gill-rakers very short, aboutten on 

 the first branchial arch. Blackish brown, uniform or indi- 

 stinctly mottled with darker. In the young specimen the 

 rays of the vertical fins are dotted with brown, five or six of 

 them (of the dorsal as Avell as of the anal) having a broad 

 black ring. In the adult example those fin-rays are uniformly 

 coloured, only traces of the dark rings being still visible. 



Yokohama Bay. 



Leuciscus hakuensis. 

 D. 10. A. 10. L. lat. 73. L. transv. 15/14. 



The height of the body is one fourth of the total length 

 (without caudal) ; the length of the head two ninths. The 

 diameter of the eye is one fifth of the length of the head, and 

 two thirds of the length of the snout, or of the width of the 

 interorbital space. The head is remarkably small, with nar- 

 row, pointed snout, the cleft of the mouth being oblique and 

 not reaching to the front margin of the eye. Upper jaw 

 overlapping the lower. Origin of the dorsal fin above the 

 root of the ventrals, midway between the snout and the root 

 of the caudal fin ; fins generally small and short, the pectoral 

 being not more than one half of its distance from the ventral. 

 Scales very indistinctly striated ; there are eight longitudinal 

 series between the lateral line and ventral fin. Pharyngeal 

 teeth 5 | 2, pointed. Coloration uniform. 



Lake Hakou. 



