of the Bay of Bengal &c. 459 
Colours in life :—“ Head and dorsum pale chocolate ; ven- 
ter pale silvery slate” (Dr. G. M. Giles). In spirit vertical 
fins transparent white; pectorals dark brown, edged with light 
rey. 
& One specimen, a female 14 inches long, with gravid ovaries. 
Hab. Bay of Bengal, lat. 20° 17’ 30” N., long. 88° 51’ E., 
in 193 fathoms. 
Group? Allied to Saccopuarrnverna. 
DYSOMMA, gen. nov. 
Soft tissues well developed; osseous tissues weak. Body 
high anteriorly and the head much inflated. Tail tapering to 
a point. Vent situated immediately behind the gill-opening, 
Snout short, slightly overhanging the mouth, its surface with 
many pores. Eyes minute, concealed beneath the skin. 
Nostrils large, lateral. Cleft of mouth wide. Minute sharp 
teeth in a single row in each jaw; a row of larger teeth in 
the vomer. Tongue not free. Four gills, communicating 
with the pharynx by wide slits. Osseous elements of the 
gill-cover rudimentary or absent. Gill-openings separate. 
Head situated between the gills. No scales. Vertical fins 
fairly developed, the dorsal beginning just behind the occiput. 
Pectorals well developed. 
Dysomma bucephalus, sp. nov. 
Head posteriorly deep and much inflated, its length mea- 
sured to the gill-opening nearly one fourth of the total. Vent 
situated with the abdominal pore on a large, round, fleshy 
clitellum immediately behind the gill-openmg. Height of 
the body at the anal level 104 in the total, and gradually 
diminishing to a point at the tip of the tail. 
Snout short, about one sixth the length of the head 
measured to the gill-opening, broad, depressed, rounded, it 
and the cheeks studded with minute pores. Eyes minute, 
their diameter about one fifth the length of the snout, con- 
cealed beneath semitransparent, partly pigmented skin. 
Nostrils large, the anterior tubular, situated near the tip of 
the snout, the posterior valvular, almost on the eye. Mouth 
wide ; jaws weak; lips inflated, each with several rows of 
small pores. ‘Teeth minute, sharp, in a single row in both 
jaws, in a single short row, rather larger, in the vomer. 
‘Tongue not free. The gill-covers are formed of a tough skin, 
in which neither bony opercles nor branchiostegal rays are 
33* 
