219 
of the Bay of Bengal. 
Eye large, circular, bulging beyond the dorsal profile of the 
head; its diameter is one third the head-length as above 
limited ; its least distance from the vertical border of the pre- 
operculum is equal to half its diameter ; supraorbital margin 
smooth ; interorbital space anteriorly posteriorly f, the 
diameter of the eye. Mouth wide, oblique, the jaw-bones 
thin and weak, the maxillary slightly expanded behind and 
not reaching as far as the preopercular angle ; villiform teeth 
developed on the vomer. Opercles large but extremely thin; 
the operculum and suboperculum both with membranous pro- 
longations backwards ; the vertical border of the preoperculum 
obliquely recurrent. 
Owing to the almost complete denudation of the integu- 
ments the nature of the scales cannot be determined. 
The dorsal fin begins to arise nearer to the tip of the snout 
than to the base of the caudal by a distance about equal to 
half the length of its own base, and its first ray is almost in 
the vertical through the origin of the ventrals ; the entire fin 
is nearly one third the length of its base in advance of the 
anal fin ; adipose dorsal well developed. The pectorals reach 
at least behind the sixth anal ray. The ventrals are broad. 
The luminous organs have been too much damaged for 
description; two series, traversing the ventral half of the 
body on each side, still remain ; two long luminous organs 
occupy respectively the mid-dorsal and mid-ventral line close 
to the base of the caudal. 
About five large pyloric caaca ; a well-developed air-bladder. 
Colours in the fresh state: — What was left of the integu- 
ment was jet-black, like the entire oro-pharyngeal cavity ; 
iris and antero-inferior part of opercles burnished silver, the 
latter in the evening twilight emitting brilliant coruscations 
of greenish-blue light. 
Total length without the caudal 3j2 inches. 
Hah. Vide Station 102. One mature female specimen. 
The shattered condition of this fish proved that it had been 
dragged up through a a great depth of water ; and its facies 
is typically bathybial. 
21. A third species of Scopelus , taken from the stomach of 
a Triyla hemisticta , must be mentioned, as it cannot be in- 
cluded among any of the species to which I have had literary 
access. 
Its radio-squamal formula is: — D. 11. A. 14. P. 12? 
Y. 8. L. lat. 32. 
Its eye is not quite one third the length of the head, the 
scales are smooth and of a uniform size, the pectorals are 
