168 "ENDEAVOUR" SCIENTIFIC RESULTS. 



rows of similar teeth. A few scattered teeth on the 

 vomer, and a short row on each palatine; no enlarged 

 fangs. Preoperculuni very narrow; its anterior edge 

 forming a pronounced ridge. Operculum, suboperculum 

 and interoperculum each separate ; their surfaces marked 

 with concentric striae. 



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 about equal to the interorbital 

 width ; twelve on the lower limb of the first arch. Body 

 now naked but showing traces of large scale-pits. 



Photophores. A large photophore is present on the 

 preorbital, another above the suspension of the pre 

 operculurn, one beneath the suboperculum and one 

 beneath the interoperculum. Nine form a row between 

 the bases of the brauchiostegal rays. Nine pairs are 

 arranged along the isthmus and one on the base of the 

 pectoral. Eleven more form a row to the ventral and 

 eight between the ventral and the anal. There are 

 seventeen in a row from above the pectoral base to above 

 the vent. Seventeen above the anal, of which the anterior 

 is placed higher than the others, and five more to the base 

 of the tail. 



The origin of the dorsal fin is nearer the base of the 

 caudal fin than the snout and is situated well behind 

 the ventral, its posterior rays overlapping the anterior 

 ones of the anal. Adipose dorsal fin well in advance of 

 the termination of the anal. The anterior anal rays are 

 much longer than those following them. Pectoral 

 reaching about three-fourths its distance from the 

 ventral; caudal forked. 



Colour. Brown above, silvery on the sides; the 

 junction of the two colours sharply defined. Opercles 

 blackish; each caudal lobe with some black rays 

 posteriorly. 



Described and figured from a specimen 158 mm. 

 long, which, however, is considerably damaged, and 

 details have been studied in other specimens. 



Variation. Nine specimens, 103-148 mm. long with 

 out the caudal fin, exhibit some little variation. D. 11-12; 

 A.27-32 ; P.10-11 ; V.7. The head is 4-24-6 in the length 

 and the depth 5-0-5-9 in the same. The photophores are 

 the same in number and arrangement in all. 



