298 Mr. A. Alcoek on the Bathybial Fishes 
Our single specimen is a female 10J inches long, with the 
radial formula 
B. 8. D. 106. A. 78. C. 6. P. dextra 18/6. 
P. sinistra 18/9. V. 2. 
It was taken at Station 105, 740 fathoms. 
Dermatorus, gen. nov. 
Allied to Porogadus, Goode & Bean, and to Bathyonus ) 
Gthr. 
Body compressed, with long tapering tail. Head with 
well-developed muciparous cavities and spiniferous bones. 
Snout depressed, with jaws conterminous in front. Eye of 
moderate size. Mouth very wide ; villiform teeth in bands 
in the jaws and palatines, few and scattered on the vomer. 
No barbel. Gill- openings very wfide ; eight branehiostegals ; 
four gills ; well-developed gill-rakers. Pseudobranchiee quite 
rudimentary. Scales small, deciduous. Lateral line indis- 
tinct. Ventral fins contiguous ; each consists of a single 
simple filament. No pyloric caeca. 
4. Dermatorus trichiurus , sp. n. 
Snout depressed, pointed. Head-bones and opercles with 
numerous acute spines. Body compressed, elongate, low — 
its height being from T y to ^ °f the total — ending in a long 
lash-like tail. 
B. 8. D. 160 -M. A. 140 + tf. C.? P. 16 (?). V. 1. 
Head symmetrically cuneiform, its muciferous cavities well 
developed, opening externally by large pores, and bounded 
by salient spinigerous crests ; its length is between ^ and \ 
of the total, its height a little more than the length of its 
postorbital portion, its breadth not quite half its length. A 
strong, acute, erect spine at each anterior orbital angle, and 
diverging backwards from it, on each side, two irregular 
rows of acute recumbent spines, the last spines of the rows 
situated respectively at the exterior occipital and the post- 
temporal angles ; operculum with a strong sharp spine above ; 
preoperculum with a double border, and each border with 
three rather distant spines radiating from its angle ; an 
obliquely reclining humeral spine. 
Snout not overhanging the mouth, depressed, rounded from 
side to side, its dorsal and ventral profiles meeting at a very 
acute angle ; its length is f that of the head, equal to the 
