NO. 1909. JAPANESE SHORE FISHES— SNYDER. 405 



Family LEPTOCEPHALID/E. 



The following key will serve to distinguish the Japanese species of 

 the genus Leptocephalus. 

 a' Dorsal fin beginning at a point above or anterior to base of pectoral. 



6' Tail short, rather blunt, not more than 3.5 times length of head; dorsal and anal 

 with black borders throughout, 

 c' Pectorals pointed; eye small, 5.5 in head; fins narrowly bordered with 



black anagn. 



J.2 Pectoral rounded; eye large, 4.7 in head; fins broadly and indistinctly bor- 

 dered with l)lack favirostris. 



b' Tail long, very slender and pointed, about 4.5 times length of head; dorsal and 



anal with black borders only posteriorly retrolinctus. 



a? Dorsal fin beginning behind base of pectoral. 



d' Dorsal fin beginning at a point above or slightly anterior to middle of pectoral. 

 e^ Maxillary long, extending to posterior border of orbit. 

 P Dorsal and anal with black margins throughout; tip of tail 



black riuHuanus. 



/2 Dorsal and anal with black margins only on posterior parts; tip of tail 



white megastomus. 



e^ Maxillary short, not extending beyond posterior edge of pupil. 



9' Pectoral pointed; dorsal and anal with black margins posteriorly 



nystromi. 



g^ Pectoral broadly rounded; dorsal and anal immaculate, .heterognathos. 

 <P Dorsal fin beginning at a point behind middle of pectoral. 

 h^ Dorsal and anal with black borders, 

 i' Lateral line with distinct whitish spots, as wide as the interspaces, 



one for each pore myriaster. 



■P Lateral line without white spots. 

 / Maxillary extending to posterior border of orbit; pectorals 



pointed kiusiiianiLS . 



p Maxillary extending only to posterior border of pupil; pec- 

 torals rounded erebennus. 



h^ Dorsal and anal light, without black borders japonicus. 



LEPTOCEPHALUS ANAGO (Temminck and Schlegel). 



Misaki and Tokyo markets. 



The dorsal is usually inserted directly above base of pectoral, 

 altltougli cases are sometimes seen where it is a little anterior or 

 posterior. 



LEPTOCEPHALUS FLAVIROSTRIS Snyder. 



Plate 51, fig. L 

 Leptocephalus flavirostris Snyder, Proc. U. S. Nat. Mus., vol. 35, 1909, p. 93. 

 Misaki; said to have come from near shore. 



LEPTOCEPHALUS RETROTINCTUS Jordan and Snyder. 



Kagosliima market. This may be easily distinguished among 

 other Ja})anese species by the very long pointed tail with its dense 

 black fins. 



LEPTOCEPHALUS MEGASTOMUS (GUnther). 



Yokohama market. 



