170 "ENDEAVOUR" SCIENTIFIC RESULTS. 



and a few very small ones on each palatine. Mandible 

 projecting beyond upper jaw. Preopercular angle 

 rounded ; its anterior margin forms a raised crest behind 

 the eye. Operculum, suboperculum and interoperculum 

 almost membranaceous with smooth surfaces. 



Four gill-arches, a slit behind the fourth. No pseudo- 

 branchiae. Gill-rakers slender, the length of those at the 

 angle of the first arch equal to that of the snout ; sixteen 

 on the lower limb of the first gill arch. Body denuded of 

 scales. 



Photophores. A large photophore is present on the 

 preorbital, another behind the eye above the suspension 

 of the preoperculum, and one at the preopercular angle 

 behind the maxillary ; two are on the suboperculum, one 

 above the other and separated by a black, metallic-hued 

 space, and six form a row on the gill-membranes 

 between the branchiostegal rays. Six are arranged in a 

 row on each side of the isthmus, the hinder ones curving 

 upward to the base of the pectoral. Ten pairs of rounded 

 photophores are present on the ventral surface between 

 the thorax and the ventral fins, and seven dumb-bell 

 shaped ones on each side beneath the pectoral fins. 

 Twenty-one form a series commencing above the ventral 

 fin, which first dips sharply downward and then runs 

 obliquely upward to above the origin of the anal, where 

 it rises abruptly and extends backward subhorizontally 

 to end above the eleventh anal ray; the anterior photo- 

 phores of this series are much larger than the others. 

 Five larger photophores are united in a row above the 

 middle of the anal, and a row of thirteen more is present 

 on each side of the lower surface of the caudal peduncle. 



Origin of the dorsal fin a little nearer the snout than 

 the base of the tail, and a little behind the vertical of 

 the ventrals; its posterior rays are above the anterior 

 anal rays. Adipose dorsal well developed, situated above 

 the posterior portion of the anal, its length equal to 

 about two-thirds the width of the eye. Anterior anal 

 rays much longer than those following them. Pectoral 

 reaching backward to beyond the ventrals. Ventrals 

 imperfect, broken. Caudal deeply forked. 



Colour. Occiput, portion of opercles, throat and 

 chest black, with iridescent colours. A saddle-shaped 

 area on the anterior portion of the back is black, and 



