of the Bay of Bengal 2 1 9 



Eye large, circular, bulging beyond tlie dorsal |)rolile of the 

 liead ; its diameter is one third the ]iead-len.i;th as above 

 limited ; its least distance from the vertical border of the pre- 

 operculum is equal to half its diameter ; supraorbital margin 

 smooth ; intcrorbital sjiace 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 prcopercular angle ; villiform teeth 

 developed on the vomer. Opercles large but extremely thin ; 

 the operculum and suboperculum both with membranous ])ro- 

 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 lengtli 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 ])ectorals reach 

 at least behind the sixth anal ray. The ventrals are broad. 



The luminous or^-ans have been too much damao-ed for 

 description ; two series, traversing the ventral half of the 

 body on each side, still remain ; two long luminous organs 

 occupy respectively the raid-dorsal and mid-ventral line close 

 to the base of the caudal. 



About five large pyloric CEeca ; a well-developed air-bladder. 



Colours in the fresli state: — Wliat 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 lengtli without the caudal 3jv inches. 



Ilab. Vide Station 102. One mature female specimen. 



The shattered condition of this lish proved that it had been 

 dragged up through a a great depth of water j and its fades 

 is typically bathybial. 



21. A third species of Scopelus, taken from the stomach of 

 a Trujla hemi'sti'cta, 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? 

 V. 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 



