NO vm. J A PA NESP: KILLIFTSnES—JORD. 1 A' A XD SXYDET!. 289 



Length a little more than 2 inches. Very common in the brooks and 

 little rivers which How into the bay.of Nagasaki, (Schlegel.) 



We did not lind this species, and no one has described it since the 

 time of Schlegel. 



(virescens, greenish.) 



ORYZIAS Jordan and Snyder, new genus. 



Ori/zins Jordan ancl Snyder, new genus {Inlipes). 



Body elliptical in form, compressed, coverea with large scales; 

 mouth small, with 2 rows of small, simple, pointed teeth; no teeth 

 on vomer; gill opening not restricted above; intestinal canal short, 

 about as long as body; peritoneum black. Dorsal tin short, inserted 

 above middle of anal; anal ytvy long, of 17 to 20 rays; caudal lin trun- 

 cate. Sexes similar, except in color; anal fin not modified in the male. 



This genus differs irom Aj/lochellus {— Panchax) of India in the 

 short jaws and in the absence of teeth on the vomer. From Zygonectcs 

 it is distinguished by the very loiuj anal. The African genus 

 ApJocJicilichfJii/s approaches it, but is sufficientl}- distinct. Rice 

 fields of Japan. 



{opvQa^ rice.) 



Type of genu^. — Oryzias lati2:>es. 



2. ORYZIAS LATIPES (Schlegel). 

 MEDAKA. 



Pcecilia Iniipcs Schlegel, Fauna Japonica, Poiss., 1846, p. 224, pi. en, fig. 5 



(Nagasaki). 



Aplochi'Uns latipcA Bleeker, Art. Soc. Sci. Ind. Neerl., VII, .lapan, p. 99 



(Nagasaki). — Jordan and Snyder, Check List, 1901, p. 57 (Yokohama); 



Proc. U. S. Nat. Mus., XXIII, 1901, p. 530 (Tokyo). 

 Haplochelus latipes Gunther, Cat. Fish, VI, 1866 p. 311, (Nagasaki). — Ishikawa 



and MATSu'iJRA, Prel. Cat., 1897, p. 18 (Tokyo). 



Ilah'itat. — Rice fields and pools of Japan, north to Tokyo. 



Head 3i in length to base of caudal; depth 3i; depth of caudal 

 peduncle 7i; eye 2i in head; snout -i; interorbital space 2ii; D. 6; 

 A. 17; scales in lateral series 31. 



Eye ver}^ large, interorbital space flat, snout short, lower jaw 

 slightly projecting. Gill openings not restricted above b}^ menibrane, 

 the opening extending to upper edge of pectoral. Branchiostegals 5. 

 (irill rakers on first arch 13, short and rather ])lunt. Jaws with 2 rows 

 of simple, pointed teeth, those in posterior row minute and difticult to 

 detect; vomer smooth; pharyngeals witii minute teeth, mostly 

 arranged in 12 or 13 transverse rows above, (i or 7 below. Intestinal 

 canal about equal to length of ))od3^ Peritoneiun dense black within, 

 the outer surface next to the body wall bright silvery. Top and sides 

 of head, throat, and chin naked; lateral line absent. Dorsal fin short, 

 its origin above middle of anal; its height equal to or greater than 



