218 Mr. A. Alcock on the Bathyhial Fishes 
less than a diameter of the eye in width anteriorly, more pos- 
teriorly. Mouth large, moderately oblique ; the jaws perfectly 
equal in repose ; the maxilla reaches the preopercular angle 
and is dilated at its hinder end ; no vomerine teeth. Opercles 
large ; the operculum produced into a membranous spur 
behind ; the vertical border of the preoperculum very obliquely 
recurrent. 
Scales extremely deciduous, smooth, cycloid, their average 
diameter one twelfth of an inch. 
The dorsal fin begins nearer to the tip of the snout than to 
the base of the caudal, but behind the bases of the ventrals, 
wdiich are much advanced, its last ray falls in the vertical 
through the first or second anal ray ; adipose dorsal entire. 
Pectorals long, extending to the first or second anal ray. 
Luminous organs : — A lateral series extending close to the 
mid-ventral line from the isthmus to the base of the caudal, 
and numbering four to base of ventral, three more to origin 
of anal, ten more to hinder end of anal, and one more at base 
of caudal ; above this rectilinear series are the following, 
rather more diffused — one at the angle of the preoperculum, 
two along the edge of the gill-opening, one on the base of the 
pectoral, two on the base of the ventral, three in a straight 
line along the middle of the flank, and three along the middle 
of the tail ; no luminous organ on the back of the tail. 
Nine pyloric caeca. A well-developed air-bladder. 
Colours in the fresh state : — Uniform silvery^ with thickly 
scattered black specks ; opercles, iris, and first branchial arch 
burnished silver. 
Total length If inch. 
Hah . Vide Station 96. About sixty specimens, many of 
them being mature females. 
20. Scopelus pyrsoholus, sp. n. (PI. VIII. fig. 3.) 
D. 12. A. 13. P. 12. V. 8. 
Head large ; body compressed. 
Length of the head, not including a membranous expansion 
of the suboperculum wdiich reaches considerably beyond the 
root of the pectoral fin, 2f in the total without the caudal. 
Greatest height of the body or of the head not quite one 
fourth of the same standard, its least height behind the adipose 
dorsal 2\ in the greatest. 
Snout almost obliterated by the encroachment of the large 
eye ; it is rounded, with the jaws exactly equal and opposed 
throughout ; its length is one fourth the diameter of the eye. 
