gilbert: the lantern-fishes of japan 97 



Measurements in hundredths of length without the caudal fin: Length of 

 head 28; diameter of eye 8; length of snout 4.5; length of maxillary 20; greatest 

 depth of body 21; least depth of caudal peduncle 9; distance from tip of snout 

 to front of dorsal 42; to insertion of ventrals 43; to front of anal 61; to adipose 

 fin 75. Length of pectorals 11.5; of ventrals 16. 



Dorsal rays 17 (including anterior rudiments); anal rays 15; pectoral rays 

 12; ventrals rays 9, the outer reduced to a short rudiment. Scales of lateral 

 line 35, the upper supra-anal on the 18th scale, the posterolateral on the 25th. 

 In a cotype, the upper supra-anal is on the 19th scale, the posterolateral on 



the 27th. 



Snout very short, bluntly rounded, its length slightly exceeding half the 

 diameter of the eye; pre-opercle only moderately oblique, the maxillary reaching 

 its margin. Gill-rakers 8 + 17, more numerous than in D. signatus. 



Pectorals short, not reaching ventrals, the ventrals not reaching beyond the 

 vent, inserted under the front of dorsal. Last dorsal ray over or shghtly behind 

 origin of anal; last anal ray under the adipose. Scales all fallen. General color 

 blackish; no dark bars evident on mandible. 



P/iotop/iores.— Upper pre-orbital small, triangular, on the orbital margin, not 

 constricted off from the broader mass of the lower pre-orbital, which fills the 

 area on the dorsal side of the nostril, narrows between the nostril and the eye 

 and continues without interruption on ventral side of orbit to or beyond vertical 

 from posterior margin of pupil. Dorsally, the upper pre-orbital interposes 

 between it and the eye, and mesially it is well separated from its fellow. It 

 differs from the pre-orbital slightly in color and appearance, and does not in the 

 lower part of its course give any evidence of union with a suborbital organ. 



Suprapectoral high, its distance from lateral line but half its distance from 

 pectoral base; attached to it a very small inconspicuous glandular organ. 

 Fourth thoracic opposite to or very slightly above the base of ventrals. Supra- 

 ventral midway between lateral line and base of ventral (in cotypes, a little 

 nearer ventral). The line joining first and second ventrals passes above the 

 third ventral, which is but little above the level of the base of the outer ventral 

 ray. Supra-anals in a straight line, or the second slightly in advance, the first 

 opposite the vent, above and behind the fifth ventral, the third in contact with 

 the lateral line, vertically above the first anal ray. Antero-anals about equally 

 spaced, the first much less elevated than in D. signatus, the line joining first and 

 second passes below the upper supra-anal. All antero-anals except the first form 

 a gently and regularly curved line rising posteriorly, the last sometimes a trifle 



