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Show 1870.J SURGEON V. DAY ON ANDAMAN-ISLAND FISHES. 699 192. RHOMBOIDICHTHYS LEOPARDINUS, Gunther. D. 80. A. 68. L. 1. 76. 193. PARDACHIRUS PAVONINUS, Lacep. Order PHYSOSTOMI. Family SILURIDCE. 191. PLOTOSUS CANIUS, H. B. Lee-mee-dah, or Bon-dah, And. Found in the muddy estuaries in considerable numbers. 195. PLOTOSUS ANGUILLARIS, Bl. Found in the same localities as the last species. 196. ARIUS SUMATRANUS, Bennett. Several specimens of this fish were obtained. 197. ARIUS ANDAMANENSIS, sp. nov. E-roung-ud-dah, And. D. i|0. P. ± V. 7. A. 16. C. 17. Length of head nearly \, of caudal |, height of body nearly 1 of the total length. Eyes. Diameter \ of length of head, 1| diameter from end of snout in the young, but greater in the adult. Head slightly broader than high. The median longitudinal groove does not extend so far as the base of the occipital process, which last is once and a half as long as it is broad at its base, and strongly keeled; basal bone narrow. Upper surface of head granulated. The maxillary cirri extend to a little beyond the base of the pectoral fin, and the external mandibular ones to its base. Teeth. Villiform in both jaws and palate, in which latter situation they form a triangular band on either side, converging anteriorly, but slightly separated down the median line. Fins. Pectoral and dorsal spines serrated on both sides, the former as long as the head without the snout, the latter somewhat longer. Upper lobe of caudal the longest. Colours. Silvery; the fins stained darker, and a black spot on the adipose dorsal. Hab. Andamans, where this fish attains a large size, but is far from being common. 198. KETENGUS TYPUS, Blkr. Family SCOPELID^E. 199. SAURIDA TOMBIL, CUV. & Val. Family SCOMBRESOCIDJE. 200. BELONE CAUDIMACULATA, C. & V. Thook-o-doo-noo-dah, And. |