94 MEMOIRS OF THE CARNEGIE MUSEUM 



As in related species, the eye is large, the snout very short and high, 

 bluntly rounded. Preopercular margin only moderately oblique, the maxillary 

 reaching its anterior border. Pectoral not quite reaching base of ventrals, the 

 latter attaining the vent. Dorsal beginning slightly in advance of base of 

 ventrals, the anal a little behind last dorsal ary, the adipose fin above the last 

 anal ray. Scales of lateral line not enlarged, their vertical diameter nowhere 

 exceeding their distance from middorsal line. 



Photophores. — Superior pre-orbital smaller than in D. chrysorhynchus, oval in 

 shape, the massive inferior pre-orbital expanding above the nostril, occupying all 

 the area between the smaller pre-orbital and the median crest, and continued 

 much beyond it dorsally; ventrallj^, the inferior pre-orbital ceases abruptly oppo- 

 site the pupil or in front of this point. No trace of an infra-orbital. Distance 

 from suprapectoral to lateral line 1.2 in its distance from base of ventrals (1.66 

 in D. chrysorhynchus). Fourth thoracic on level of base of ventrals, the third 

 ventral only a trifle higher, much below the level of the supraventral, which is 

 over the axil of the ventral and is nearer ventral base than lateral line. Third 

 supra-anal immediately below lateral line, the three of the series in an oblique 

 line, not angulated, the lowermost opposite the vent, above and behind the 

 fifth ventral. First antero-anal elevated, not so high as middle supra-anal, in a 

 line joining the upper supra-anal and second antero-anal. Second to fifth antero- 

 anals form a slightly curved line which gently rises, the sixth more elevated. 

 Postero-anals 5. Posterolateral but little below the lateral line, a trifle farther 

 removed than the upper supra-anal. Precaudals forming a broad curve; the 

 first two slightly less separated than the other two, the uppermost not so near 

 the lateral line as the posterolateral. 



Color very dark. A broad dark bar across mandibles below eyes; mouth 

 and gill-cavity black. 



Two cotypes from Sagami Bay, the largest 21 cm. (C. M. No. 4602). The 

 type is deposited in the Carnegie Museum. 



21. Diaphus coeruleus (Klunzinger) . 

 Scopelus coeruleus Klunzinger, Verh. k. k. zool. bot. Ges. Wien., Vol. 21, 1871, 



p. 152. (Indian Ocean.) 

 Diaphus watasei Jordan and Starks, Bull. U. S. Fish Com. for 1902 [1904], 



p. 580. (Sagami Bay.) 

 Scopelus engraulis Giinther, Deep Sea Fishes Challenger, 1887, p. 197, PI. LI, 



fig. C. (PhilipiDine Islands.) 



