| OCR Text |
Show 618 SURGEON F. DAY ON T H E [Dec. 9, margin. Ventral small, inserted behind the posterior dorsal ray. Caudal 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. D. ||0. P. 1/7. V. 6. A. 2/44. C. 17. Length of head 4;, of pectoral \, of caudal \, height of body \ of the total length. Eyes behind cleft of mouth. Diameter nearly \ of length of head, 1 diameter from end of snout, 1 \ 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. \\0. P. i. V. 6. A. ±£. C. 15. Length of head f, of pectoral \, of caudal | of the total length. Height of head nearly x, of body \, of dorsal fin ^ of the total length. Eyes. Diameter \ of length of head, 2\ diameters from end of snout, 1^ 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 |
