280 NEW GENERA AND SPECIES OF FISHES. By J. Douglas Ogilby. SILURID^. Arius peoximus, sp.nov. D. i 7, 0. A. IG. Depth of body 4, length of head 3 in the total length; width of head | of its length, the upper profile undulating and moderately-oblique. Eye with free lid, its diameter 6 in the length of the head and 2^ in that of the snout, which is rounded and If times as wide as long. Interorbital region gently rounded, its width considerably more than that of the mouth and If in the length of the head. Premaxillary teeth in a continuous band, which is deeply emarginate behind, obliquely truncated at the extremities, and six times as long as wide; mandibular band divided, gradually tapering from the symphysis; vomerine patches well developed, nearly square, confluent with one another and with the palatine patches, which are triangular, divergent posteriorly, a little longer than wide, and as wide as the united vomerine patches. Maxillary barbel | of the length of the head, not extending directly back-wards to the margin of the opercle; postmental barbel ^ of the maxillary, inserted behind and outside the mental, which does not nearly reach the gill-opening. Cranial shield finely and irregularly granular, the granulation extending to the supraorbital region, but not nearly to the gill-opening. Nuchal shield evenly granular, its greatest width but little less than its length, which is 3^ in its distance from the tip of the snout; outer border deeply concave, the hinder emarginate. Dorsal plate moderate, crescentic, granular, its mesial length 5^ in that of the nuchal shield, with which it is in contact. Fontanelle inconspicuous; occipital groove deep and long, extending from between the posterior third of the eyes to the nuchal shield. Opercle smooth. Lateral line without
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