74 Zoological Society :— 
Order MALACOPTERYGII. 
HALOSAURUS, gen. nov. 
Body elongated, clothed with cycloid scales; belly rounded ; tail 
compressed and tapering toa point. Snout projecting much beyond 
the mouth, which is non-protractile and of moderate size, with the 
upper border formed by the premaxillary and maxillary bones, the 
former small, the latter of moderate size and not reaching beyond 
the eye, both dentiferous. ‘Teeth in villiform bands, in the jaws and 
on the vomer, palatines, and tongue. A short dorsal over the space 
between the abdominal ventrals and the long anal, which is coales- 
cent with the caudal, the latter consisting of very few rays. Large 
gill-openings. Branchiostegal membrane with numerous rays. Sto- 
mach cecal; pyloric czeca in moderate number ; a large air-bladder. 
No pseudobranchie, no barbel nor adipose dorsal. 
HALoSAURUS OVENII. 
Dalle Poli. Ve 10,- Ac 19l! C225) MB 14 Se sealeston 
lateral line about 170. 
Body elongated, compressed, attenuating in both directions from 
the neighbourhood of the dorsal fin, the tail becoming filiform ; the 
belly rounded, except in the neighbourhood of the ventral fins, where 
it is flattened. Clothed with cycloid scales of a moderate size. The 
height compared with the total length is as 1 to 143. The back and 
sides are brown, the middle of each scale being bluish grey with mi- 
nute black dots. The belly is grey. 
The head has something of the aspect of that of a Macrourus or a 
Coilia, the mouth being on the underside. Compared with the total 
length it isas1to 7}. It is unarmed, scaly, slender and depressed, with 
a projecting snout. At the back there is a transverse narrow scaleless 
groove, which curves forwards slightly. The lateral eye is oval, with 
an angle before and behind. Compared with the length of the head 
itisas 1 to 5. . It reaches to the profile, and is distant from the snout 
nearly two of its longer diameters; and the space between the eyes 
is less than one of such diameters. The snout is curiously formed ; 
it is much depressed and narrows forwards, but the extremity is 
rounded. There is an undulating crest near each edge above, and 
another at each side below, with a mesial keel underneath. It is 
scaleless, and covered with a soft gelatinous skin. There is a crest 
across the cheek below the eye, and a groove extends forwards from 
the inferior margin of the orbit at each side of the snout. 
The moderate-sized mouth does not reach nearly to the tip of 
the snout. Neither jaw is in the least protractile. The anterior 
portion of the upper border is formed by the premaxillary, the re- 
mainder by the maxillary, and both bones are set with a band of 
minute sharp villiform teeth. There is a crest along each border of 
the maxillary ; and that at the posterior margin projects as a tooth, 
which reaches to the orbit. The maxillary is simple, not composed 
of three pieces as in the Clupeide. 'The mandible is set with teeth 
similar to those before described. There are no teeth on the vomer; 
