132 



orbital space and 7 — 8 in snout. Head flat above, with a broad 

 median groove, which is scaly anteriorly and has a median 

 ridge in its posterior part. Supraorbital region striated. Oper- 

 culum smooth. Mandible very high, its height below pupil 

 only a little less than diameter of eye. Canines short and 

 slender, those of the upper jaw slightly directed backwards. 

 Tongue smooth. Maxillary entirely or almost entirely hidden 

 by praeorbital. Pectorals variable in length, equal to postorbital 

 part of head or much longer. Ventrals 1.2 — 1.4 in pectorals; 

 their base somewhat nearer to frontborder of eye than to 

 base of caudal. Origin of dorsal above 4th divided ray of anal, 

 separated by 28—32 scales from lateral line. Middle dorsal 

 rays shorter than anterior and posterior ones. Anterior anal 

 rays much longer than the other ones, which are subequal. 

 Lateral line without distinct keel on caudal peduncle, which 

 is compressed, but less so than rest of body. Caudal forked. 

 Back darkbrown with a green reflection, sides and belly silvery, 

 the two colours rather sharply separated. Six to eight more 

 or less conspicuous dark crossbands on the body behind ventrals. 

 Dorsal almost totally blackish, pectorals and ventrals yellowish, 

 the former with black tips. Caudal dusky. Length over looo mm. 



Nom. indig. : Djulong-djulong (Malay. Batavia), Sakku 

 (Ternate). 



Habitat: Pulu Weh ! ; Java (Batavia, Semaraug !); Ternate; 

 Aru Islands!. — Red Sea, Indie, Pacific: to Japan and the 

 Sandwich Islands; Atlantic: West Indies, ranging from North 

 Carolina to Brasil. 



Note. We have compared our specimens from the indo- 

 australian Archipelago with an Atlantic specimen from Curagao 

 and cannot find any difterence. This species is rather a variable 

 one, but this variability is independant from the geographical 

 distribution. Specimens from the indo-australian Archipelago 

 for instance show all the differences, which Ogilby (1. c.) 

 supposes to exist between the atlantic, the east pacific and 

 the australian specimens. 



4. Xenentodon Tate Regan. 



(C. Tate Regan, Ann. Mag. Nat. Hist. (8) VII. 191 1, p. 332). 



Very elongate. Body cylindrical or subcylindrical. Inter- 

 maxillaries and mandibles prolonged, forming a beak. Both 



