288 I'lKKl'lKDINilS OF THE NATIONAL MUSEUM. vol. xxxi. 



developed as an intromittent organ. Fresh-water fishes of southern 

 Europe, Asia, Africa, and America, sonic of them occurrino- in bays 

 and arms of the sea. They arc mostly of small size, and the si)ecies 

 are very diiticiilt of determination. The species are known in Japan 

 as Medaka. 



KEY TO GENERA. 



a. nitesthml canal comparatively short, little convoluted; teeth little movable; bones of the den- 

 tary firmly connected; the lower jaw strong and usually projecting beyond npper; species 

 chiefly carnivorous. 

 h. Anal fin of the male similar to tliat of the femalf anil not ii!(i<lili«Ml inlo an intromittent 

 organ. Species oviparous, 

 c. Teeth all pointed, none of them comi>ressed or bicuspid or tricuspid. 

 Fundulin^e: 

 d. Ventral flns well developed; pharyngeal bones and teeth not enlarged. 



e. Teeth in villiform bands or at least in more than one series; no teeth on vomer; 

 jaws short. 

 /. Anal fin short, of about 10 rays, inserted behind last ray of the sborl dor- 

 sal fin. FUNOITI.ICIITHYS 

 ff. Anal fin very long, of about 20 rays, inserted before first ray of dorsal fin. 



Oryzias 



FUNDULICHTHYS Bleeker. 



Fundulichthys Bleeker, Conspectus Syst. Cyprinorniii, 1860, ]>. 439 {rircscriis). 



This genus is imperfectly known. It appears to difl'er from the- 

 American genus or su))genus Zy(j07iectes in having the small dorsal 

 inserted wholly in advance of the equally small anal. According to 

 the drawing of Burger, published l)y vSchlegel, the caudal tin is lunate. 

 The single species is Japanese. 



{fundulus, a related genus, ix^^'^, tish.) 



I. FUNDULICHTHYS VIRESCENS (Schlegel). 

 OMEDAKA (large killifish), AKITABIRA (autumn minnow). 



Fimdulus pin'M-ens Scitlegel, Fauna Japonica, Poiss., 1846, p. 225, pi. cii, fig. 6.— 



Namiye, Class. Cat, 1883, p. 107 (Tokyo, Nagasaki). 

 Fundulichihys lirescenslsmK AW A Sind Mat.su' iJR A, Prel. Cat., 1897, p. 18 (Owari).— 



Jordan and Snyder, Check List, 1901, p. 58. 



Habitat. — Brooks of southern Japan. 



Schlegel's description of this species is based solely on a drawing by 

 Burger. B. 4, D. 9, V. 7, P. 14, C. 18. Length of head etpial to depth 

 of trunk at pectorals, nearly one-tifth of total length. Jaws with 

 many series of teeth, the median teeth largest. Eyes moderate. 

 Scales of moderate size, the lateral line (rather a lateral streak of 

 color), nearer back than belly. Vent nearer tip of caudal than tip of 

 head. Dorsal fin in the middle of the ])ack; it is small, as is also the 

 anal. Caudal Hn a little notched. Pectorals inserted below the angle 

 of opercle. 



Color in life olive green, darker on the back, paler on the sides, 

 whitish l)elow; dor.sal, anal, and notal)ly the caudal orange yellow. 



