gilbert: the lantern-fishes of japan 89 



of head 37; greatest depth 27; least depth of caudal peduncle 14; axial length 

 of snout 5; diameter of eye 9; length of maxillary 24; distance from tip of snout 

 to origin of dorsal 47; to insertion of ventrals 49; to front of anal 64. 



Dorsal rays 15; anal rays 15; pectoral rays 11 or 12. Scales of lateral line 36. 

 Snout bluntly rounded, but protruding beyond the eye farther than in D. 

 nanus and related species, its axial length somewhat greater than half the 

 diameter of the eye. Maxillary long, extending beyond the orbit a distance 

 equaling seven-ninths the diameter of the orbit, its posterior portion not 

 widened; pre-opercular border oblique. 



Pectorals reaching base of ventrals, the latter slightly overlapping front of 

 anal. Insertion of ventrals behind the vertical of origin of dorsal; anal not 

 overlapping the dorsal. 



P/ioiop/iores.— Pre-orbitals small roundish bodies immediately above the 

 nostrils, directed forwards and little visible from the side; they are about as 

 large as the nostrils and are widely separated mesially; from their lower outer 

 border a very narrow luminous streak extends downwards around the anterior 

 border of the eye, but not on its ventral aspect. The posterior outer border, both 

 of the slender streak and of the rounded expansion above the nostril, is densely pig- 

 mented. No line of division can be detected between the two portions. No sub- 

 ocular spot. Suprapectoral midway between lateral line and base of pectoral. 

 Fourth thoracic above and a trifle behind the third, on the level of the middle of 

 pectoral base. Second thoracics midway between first and fifth, the second and 

 fourth interspaces nearly equal. Supraventrals slightly nearer base of ventrals 

 than lateral line. Third ventral lower than supraventral, on a level with the 

 second supra-anal. Upper supra-anal in contact with the lateral Hne, or a mere 

 trifle below it, vertically above the second, which is above and a httle behind 

 the first; the first and second are very close, the space between them less than 

 half that separating the second and third, and the first is still nearer the fifth 

 ventral, which is before and a little below it. First antero-anal elevated, nearly 

 as high as the second supra-anal, in an oblique line joining second antero-anal 

 and upper supra-anal. Antero-anals 6, the second to the fifth in a straight line 

 diverging from base of anal a little posteriorly, the sixth elevated, obliquely 

 above and behind the fifth, the last interspace equal to those that precede. 

 Posterolateral vertically above the sixth antero-anal, in contact with the lateral 

 line. Postero-anals 5, all on the same level. Precaudals 4, the first three 

 equally spaced, in a gentle curve following base of lower caudal lobe, the fourth 

 more elevated, above and behind the third, very near the lateral line, the third 

 equidistant from the first and the fourth. 



