346 PROCEEDINGS OF THE XATIONAL MUSEUM. v<.i..xxiir. 



deeply notched, the rays pointed. Pectorals obtusely pointed. Ven- 

 trals not I'cuchiti^' \(Mit. Lateral line extendino' along middle of body 

 and caudal peduncle; straight, except a slight upper curve on anterior 



4 or 5 scales. Color, light; a silvery lateral l)and; a faint dark spot at 

 base of caudal; a narrow, dark, median dorsal band (extending from 

 head to base of caudal; upper parts with miiuite dark dots, especially 

 on edges of scales; dorsal tin a little dusky; others without color. 



One s])ecimen, ])r()bably young, 7;> mm. long. 



LEUCISCUS HAKUENSIS Gunther. 

 {LenritirKii hakonensi.s Ishikawa). 

 Lake Biwa, Tokyo (Otaki, Ischikawa); Hakodate {Alhatross). 

 Said to be ever^^where conuuon in the main island of Hondo. 

 Dr. Ishikawa suggests the change of Ii(ih-He)htis to lialvDcns/x^ in 

 ai'cordance with the proper flapaiu^se spelling of Hakone. Such a 

 change is, however, not allowable in oui- view of the law of priority. 

 "A name is a name, without necessary meaning." 



ISCHIKAUIA Jordan and Snyder, new genus. 



Diagno.'<!x. — Body compressed; caudle pediuicle deep. Mouth 

 obliciue; lower jaw slightly projecting; maxillary freely protractile, 

 not extending to edge of orbit; no barbels. Teeth, all slightly hooked, 

 with a narrow grinding surface; in 3 rows; 3 or 4 on tirst of outer row, 



5 on second, 2 on third or inner row. Pseudobranchia' present, (iill- 

 rakers on tirst arch, 13+4; low, pointed. Alimentary canal twice as 

 long as ])()dy. Air bladder in 2 divisions, extending posteriorly to 

 vent. Peritoneum with black pigment. Scales of moderate size, about 

 65 in lateral line; 13 from lateral line to insertion of dorsal. Lateral 

 line sharply decurved anteriorly, gradually curving upward and extend- 

 ing posteriorly along middle of caudal peduncle. Dorsal inserted a 

 little behind origin of ventrals, of 9 raj^s; tirst ray, short and closely 

 adnate to the next; second ray, spine-like, strong; other rays, branched. 

 Anal rays, 17; the tirst two spine-like ones, weak. Caudal, forked; 

 the tips sharp. Pectorals pointed. 



Hie genus hchikanta is apparently related to X<'n<)ciij>i'l^' The latter 

 has the dorsal inserted in adv^ance of the ventrals, the scales larger, 

 and the teeth 6, 3, 2-2, 3, (5. 



Named for Prof. Chiyomatso Ishikawa, of the Im})erial Museum of 

 Tokyo. 



ISCHIKAUIA STEENACKERI (Sauvage). 



{Opsariiclithi/s .slcen<(ckr)'i Sauvajj;e. ) 



(Plate X.) 



Five specimens of Miil-anta ste(macl'('r! viore collected in Lake Biwa 

 by Professor Ishikawa. Others, which are lighter in color, were col- 

 lected in the same lake by Mr. Otaki. 



I 



