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Show 710 SURGEON F. DAY O N T H E [Dec. 5, has the smallest air-vessel amongst the larger species which I have examined. The genus extends throughout India and Burmah. CALLICHROUS EGERTONII, sp. nov. Palloo, Punj. D. 4. P. 1 V. 8. A. 52-54. C. 17- Length of head about £ (-±-), of caudal ^, height of body £ of the total length. Eyes. Diameter jr of length of head, 2 diameters from end of snout. Snout obtuse, rounded; lower jaw strongly prominent. Maxillary barbels extend a little beyond the base of the pectoral fin, the mandibular pair are nearly half as long as the head. Teeth vomerine, in two separate patches. Fins. Dorsal very narrow; pectorals rounded, rather longer than the head without the snout, its spine moderately strong, nearly as long as the postorbital portion of the head, and strongly denticulated internally; anal terminating close to the caudal, but separated from it; the latter fin forked in its posterior half, its upper lobe the longest. Colours. Olive, shot with purple and gold, its body and fins covered with blotches of a brownish colour; a large black finger-mark over the posterior half of the pectoral spine. Hab. Subhimalayan range in the Punjaub. I have named the species after the Hon. R. Egerton, from whom I have received great assistance in m y investigations. Geographical distribution.-This genus extends throughout India and Burmah to the Malay archipelago. The distinctions between Cryptopterus, Bleeker, in the extended sense as accepted by Dr. Giinther, and Callichrous seem to show the unadvisability of separating them into distinct genera. Genus WALLAGO, Bleeker. Air-vessel of moderate size, situated in the anterior part of the abdomen; on removing its front wall it is found to be divided into two lateral chambers by a longitudinal septum, which, however, has a rounded orifice anteriorly, so as to admit of free communication between the two sides. Geographical distribution. - India, Burmah, and the Malay archipelago. Genus O L Y R A , M'Clelland. Dorsal profile nearly horizontal, neck not elevated. Body low and elongate. Head depressed, superiorly covered with soft skin. Mouth terminal, transverse ; jaws about equal iu length, or the lower the longest. Nostrils remote from one another, the posterior provided with a barbel. Gill-openings wide, the membrane not confluent with that of the isthmus. Barbels eight. Eyes small, subcutaneous. Villiform teeth on the jaws and palate. First dorsal fin without a |