618 SURGEON F. DAY ON THE [ Dec. 9, 
margin. Veutral small, inserted behind the posterior dorsal ray. 
Candal forked. 
Colours. Silvery, darkest above ; a small black spot at base of the 
dorsal fin. 
Hab. The Irrawaddi and its branches, growing to 8 or 10 inches 
in length. It is very common. 
PsEUDEUTROPIUS ACUTIROSTRIS, Sp. nov. 
Dirt. PalfiveG. tA. 8/44 0 a7. 
Length of head }, of pectoral +, of caudal 4, height of body + of 
the total length. 
Eyes behind cleft of mouth. Diameter nearly 4 of length of head, 
1 diameter from end of snout, 14 diameter apart. 
A considerable rise occurs from the snout to the base of the dorsal 
fin. The upper jaw elongated and pointed, extending some distance 
beyond the lower jaw. 
Upper surface of head slightly rugose; superior longitudinal 
furrow extends to the base of the occipital process, which is narrow, 
? as wide at base as it is long; the triangular bone in front of the 
dorsal fin descends some distance down to meet the occipital process, 
which is emarginate to receive it. Cleft of mouth equals half its 
gape. Maxillary cirri reach the base of the anal fin; the rostral are 
longer than the head; the two pairs of mandibular, which arise on 
a transverse line, are longer than the head. 
Teeth villiform in both jaws, that in the upper widest and entirely 
in advance of the lower jaw; in two minute patches on the vomer, 
and of the same character in the palatines, not continuous with those 
on the vomer. 
Fins. Dorsal spine sharp, pointed, entire, as long as the head to 
the angle of the mouth. Ventral arises somewhat behind the dorsal 
fin. Pectoral spine very strong, coarsely denticulated, with about 
ten teeth, as long as the head without the snout. Caudal deeply 
forked. 
Colours. Silvery, a black spot on occiput; a black base to the 
dorsal fin. 
Hab. Throughout Burma. Rarely exceeds 4 inches in length. 
ARIUS BURMANICUS, Sp. Nov. 
B.vi. D.7|0. PG. V6. AS C15. 
Length of head 2, of pectoral +, of caudal + of the total length. 
Height of head nearly 4, of body +, of dorsal fin + of the total length. 
Eyes. Diameter + of length of head, 24 diameters from end of 
snout, 14 diameter apart. 
Head depressed ; body elongated and compressed. 
Snout spatulate; upper jaw longest. Maxillary cirri reach the 
base (or middle in the immature) of the pectoral fin; the external 
mandibular are nearly as long, the internal slightly shorter. The 
longitudinal furrow on the summit of the head does not extend so 
