1 67 



V 



opposite to origin of ventrals. Anal equal to dorsal or slightly 

 shorter, its origin somewhat behind end of dorsal. The small 

 adipose fin opposed to hindermost rays of anal. Pectorals pointed, 

 shorter than postorbital part of head, reaching ventrals, which are 

 longer than the pectorals. Caudal deeply incised. Scales cycloid. 

 Luminous organ : Antorbital small '). Two operculars, a larger 

 dorsal one below the level of inferior margin of eye, a smaller 

 lower one behind upper jaw. 3 branchiostegal ones. 5 PO, 

 the 3 anterior and the fifth equidistant, the fourth above the 

 third. 2 PVO, the posterior one near lower base of pectoral, the 

 anterior one obliquely before and below it. PLO nearer to lateral 

 line than to base of pectorals. 5 VO, the first, fourth and 

 fifth in a ventral series, the second and third in the space 

 between the first and fourth, forming with the first an obli- 

 quely ascending line, the second being closer to the first than 

 to the third. AO in 2 groups, the anterior group with 5 7, the 

 posterior with 4 6 organs. The first and last anterior one may lay 

 higher up outside the series. The second group begins behind 

 the anal. 4 Prc in a curved line, the hindermost high up near 

 lateral line. VLO nearer to lateral line than to origin of ven- 

 trals. SAO in a straight or slightly curved line, the lower 

 one above anus, the upper one in the vertical through end of 

 dorsal, quite near lateral line, as also Pol. Violet brown, oper- 

 cles silvery. Length 80 mm. [Bleeker's typical specimens seen 

 by us]. 



Nomen in dig. : Bulan bulan (Menado). 



Habitat: Celebes (Menado)!. - Tropical Indie. Pacific: 

 Hawai (M. urolampus). Atlantic between 39 N. and 37 S. 



12. Myctophum suborbitale (M. Web.). 



Diaphus suborbitalis Max Weber, Siboga-Exp. Fische, 1913, p. 90. 



D. 15; A. 14; P. 12; V. 9; L.I. circa 38. 



Height more than 4'/ 2 to nearly 5, head ^\ v eye 3 ! / 3 5 3 / 5 - 

 Snout 2 ! / 4 in eye, very short and steeply descending, with a 

 strong median keel running in the interorbital space which is 

 J / G broader than eye diameter. Mouth oblique. Upper jaw 



i) Diaphus nocturnus, which we have cited as a synonym, has according to 

 Gilbert a small suborbital organ below the anterior portion of the orbit. 



