Dn somewhat elongate, extending down to level of nasal apparatus; Ant close under the 

 supraorbital ridge, about half the size of Dn; Vn long, extending from nearly under anterior 

 margin of pupil up to and in contact with Dn; anteroventral portion of Vn enlarged, extending 

 out to under the nasal apparatus. A prominent band of dark pigment separates Dn and Vn 

 from the orbital rim. 



Size: To 140 mm. 



Least depth of capture: The South Africa specimens, from off Durban, were taken between 

 500 and 545 m in daylight (Galathea Sta. 197). 



Distribution: Diaphus coeruleus has not yet been taken from the eastern Pacific Ocean. 

 Known primarily from the Indo-Pacific and western Pacific region and is included here in case 

 it may be taken in the poorly collected west-central portion of the eastern Pacific. 



Diaphus chrysorhynchus 



Gilbert and Cramer, 1897 



Fig. 110 — Diaphus chrysorhynchus, male, 62.0 ram. 



Description 



 D. 16-17; A. 16 (15-17); P. 12 (11); AO 6 (7) + 5(4-6), totalll (12); gill rakers 7 + 1 -h 14 

 (five specimens); vertebrae 35 (34-36). 



SAO in a steeply oblique line that passes a little behind VO5. SAO2.3 interspace at least 

 twice that of SAO,.-; Pre interspaces progressively wider. The opercular margin tapers to sharp 

 point below PLO. The adipose tissue covering the entire snout appears to be luminous. There is 

 no information available on sexual dimorphism in the luminous organs of the head. All five 

 specimens before me are males. 



Size: To about 80 mm. 



Least depth of capture: At surface at night, 500-600 m in daylight. 



Distribution: Known only from immediate area of Hawaiian Islands, the type locality. 



Diaphus adenomus 



Gilbert, 1905 



Description 



D. 15 (14-16); A. 15; P. 11-12;A0 6 + 5-6, total 11-12; gill rakers 5 -^ 1 + 10-11, total 16-17 

 (Gilbert recorded 5-1- 1-1-13 rakers for the holotype, but I found b + I + 111 vertebrae. 



PLO and VLO slightly nearer lateral line than to pectoral and pelvic origins. First 3 VO in 

 flatly oblique nearly horizontal line, VO:, about on a line from POj to SAO,. Three SAO in 

 steeply oblique, nearly straight line that passes a little behind VO:,. First AOa elevated to 



118 



