1909.] R- E. Lloyd ; Deep-Sea Fish caught by the “ Investigator ” 145 
Consistency and general appearance distinctly bathybial. Colour dark brown 
above, greyish brown below. 
Habitat.— Gulf of Aden ; 130 fathoms. Station 360. Registered Nos. F 
Benthohatis moreshyi, Alcock. 
Ann. Mag. Nat. Hist. (7), vol. v, p. 145 (1898) ; Cat. Indian Deep-Sea Fish, p. 18 
(Calcutta, 1899); Illustr. Zool. “Investigator,” Fishes, pi. xxvi (1899). 
One small specimen from 585 fathoms, off the south coast of Arabia. Station 
358. Registered No. F . 
Order TELEOSTEL 
Suborder Malacopterygii. 
Family ALEPOCEPHALIDÆ:. 
Genus Platytroctegen, nov. , 
Resembling the genus Platytroctes (Günther), but differing from it in possessing 
small but well-developed pelvic fins. The deep folds of skin which in Platytroctes 
form the dorsal and ventral contours of the body are not empty as in that genus but 
are occupied by a thick layer of connective tissue. The scales are not keeled. 
Platytroctegen mirus, sp. nov. 
B. 6, D. 23, A. 23, P. 28, V. 5. 
The greatest depth of the body is one-third of the total length without the cau- 
dal. The length of the head is slightly more than a quarter of the total without the 
caudal. The diameter of the eye is slightly less than one-third the length of the 
head. The length of the snout is equal to half the diameter of the eye. 
Minute teeth occur in a single row on the premaxillaries, maxillaries and den^ 
taries ; there are a few small teeth on the vomer. The palatines are toothless. 
The innermost of the four gills is half the length of the others. Filaments and 
rakers are about a third of the diameter of the eye, the gill-rakers of the first arch are 
longer than the others. 
A small tubular papilla with an apical pore rises from the skin a short distance 
behind the operculum on a level with the centre of the eye. 
The upper surface of the head, which is triangular and nearly flat, is bounded on 
either side by straight supraorbital ridges, converging in front. The supraorbital 
ridge, the infraorbital and pre-opercular bones each support a muciferous canal open- 
ing at intervals. 
The lower ends of the clavicles, which together form a remarkable bony spine, 
are in contact up to their apices. 
The gill-cover of the left side overlaps that of the right side at its lower end, 
where it contains an extra or seventh small branchiostegal ray, not represented on 
the right side. 
