256 Annals of the Carnegie Museum. 



rays; caudal fin truncate. Sexes similar, except in color; anal fin not 

 modified in the male. (Jordan & Snyder.) 

 Distribution: Japan; Corea; Formosa. 



47. Oryzias latipes (Temminck & Schlegel). 

 Medaka (Japan); Tamhii (Formosa). 



1846. Pcecilia talipes Temminck & Schlegel, Fauna Japonica, Poiss., p. 224, PL 



CII, Fig. 5; Nagasaki. 

 1866. Haptocheilus talipes Gijnther, Cat. Fish., \T, p. 311, Nagasaki. 

 1901. Aploclieilus talipes Jord.\n & Snyder, Proc. U. S. Nat. Mus., XXIII, 



P- 350. 

 1906. Oryzias talipes Jordan & Snyder, Proc. U. S. Nat. Mus., XXXI, p. 289; 



Japan. — Snyder, Proc. U. S. Nat. Mus., XLII, 191 2, p. 407; Shiogama; 



Yamaguchi; Akune; Nanao; Dogo Island. — Jordan & Metz, Mem. Carneg. 

 ■ Mus., VI, no. 2, 1913, p. 24; Fusan; Suigen, Corea. — Jordan, Snyder, & 



Tanaka, Journ. Coll. Sci. Tokyo, XXXIII, 1913, p. 91; Japan. 



Head 4 in length; depth 4.5; depth of caudal peduncle 9.5; eye 2.5 

 in head ; interorbital space 2 ; snout 4 ; D. 6 ; A. 1 8 ; P. 9 ; V. 5 : thirty-one 

 scales in a lateral series; five branchiostegals. 



Posterior half of the body compressed, becoming broader anteriorly, 

 highest in front of the anal; head flattened; interorbital space broad; 

 snout shorter than the diameter of eye, broadly rounded anteriorly; 

 mouth anterior, transverse; lower jaw slightly projecting, each jaw 

 with two rows of minute pointed teeth, those on the posterior row 

 smaller; vomer smooth; thirteen short, pointed gill-rakers on the first 

 arch; eyes very large, anterior and superior. 



Dorsal fin short, on the posterior half of body, its origin above the 

 posterior two-thirds of anal, its height ec}ual to the distance between 

 tip of snout and posterior margin of orbit; pectoral inserted on the 

 median line of body, its length contained 5.5 in the length of body; 

 the ventral small, reaching vent; base of the anal very long, its pos- 

 terior end opposite to that of the dorsal, anterior ray longest; tip of the 

 caudal fin rounded. 



Top and sides of head, throat, and chin naked; body covered with 

 thin cycloid scales; lateral line absent. 



Color in formalin pale gray above, lower parts silvery; a black 

 longitudinal streak from the nape to the origin of the dorsal; sides of 

 body with a faint dusky stripe along the middle line, top of head 

 dark; the edges of scales dusky; fin-rays of the ventral and anal dotted 

 with minute black spots; all the fins whitish; jieritoneum black. 



Length of body 28 mm. 



i 



