454 Mr. A. Alcock on the Bathybial Fishes 
form one, followed by a small circular one, in the middle line ; 
a large circular one behind two converging cuneiform ones in 
each temporal region. 
Length 14 inches. 
Two specimens, females with gravid ovaries, both in 
fragments. 
Hab. Gulf of Manaar, lat. 6° 32! N., long. 79° 37’ E., in 
675 fathoms. 
HALOSAURICHTHYS, gen. nov. 
Differing from Halosaurus in possessing a long rudimentary 
second dorsal fin and in having the ventrals united into a 
broad flat plate. 
Halosaurichthys carinicauda, sp. nov. 
Beige. Ml. Petoe. ValO) dete 
5 
Head short, its length being 73 in the total and tapering 
from the broad branchial region to the pointed snout. Body 
long, low, and somewhat compressed, its greatest height being 
equal to the length of the postocular portion of the head. 
Tail long and tapering. Snout overhanging the mouth, its 
length three times that of the eye or of its preoral portion. 
Preoperculum small; suboperculum much larger than the 
operculum. ‘Two parallel, wide, mucous channels, closed 
over by a thin, tough, white membrane, extend, one from the 
preorbital to the front limit of the operculum, the other from 
the mandibular symphysis te the hinder edge of the sub- 
operculum. yes lateral, small, their major diameter 33 in 
the postocular portion of the head and greater than the width 
of the interorbital space. Nostrils large, the anterior sepa- 
rated from the posterior by a broad, black, outstanding loop 
of skin. Mouth narrow ; the maxilla not reaching to the 
vertical from the front margin of the orbit. Villhform teeth 
in broad bands in the jaws and hyoid, forming a broad crescent 
in the prominent loose palatines and a short narrow band in 
the pterygoids. Gull-membranes entirely separate; four 
gills; first branchial arch with some rather long bacillate 
gill-rakers. Head covered everywhere, including the glosso- 
hyal region, with small or minute adherent scales. Body with 
large, thin, rather deciduous, cycloid scales, not larger along 
the lateral line than elsewhere. Small scales on the lower 
half of the dorsal fin and along the extreme base of the anal. 
The lateral line shows as an indistinct opaque white thread. 
Dorsal fin short, arising just behind the origin of the ventrals. 
— aaa 
