_Gill-covers._—The preoperculum is narrow; its upper limb rising vertically forms a right-angle with the lower one; and its edge is armed with small spinous teeth, those on the lower limb being directed forward. The bony operculum terminates in a narrow sub-spinous point, beneath which there are three denticulations, with grooves running backward from them. An acute-pointed membranous flap prolonged from the margin of the suboperculum conceals these parts in the recent fish. The edge of the interoperculum and posterior part of the suboperculum are minutely denticulated. The edges of the humeral bones are slightly grooved and denticulated, the denticulations being more obvious in some individuals than in others. _Scales._—There are sixty scales on the lateral line, and twenty-two in a vertical row between the first dorsal and centre of the belly. The scales are rather small, their bases truncated and furrowed to near the middle (_striées en éventail_) by six grooves corresponding to eight minute lobes of the margin. A narrow border of the outer rounded edge is very minutely streaked, producing teeth on the margin, visible under a lens. The length and breadth of a scale, taken from the side, are about equal, being two and a half lines. A linear inch measured on the sides or belly, longitudinally, contains twelve scales, the scales on the belly having, however, less vertical breadth. On the back an inch includes seventeen or eighteen. The asperity of the scales is perceptible to the finger, when it is drawn over them from the tail toward the head. The lateral-line is thrice as near to the back as to the belly, and is slightly arched till it passes the dorsal and anal fins, when it runs straight through the middle of the tail. It is marked on each scale by a tubular elevation, which is divided irregularly by an oblique depression. _Fins._—Br. 7—7; D. 13—1 | 13; P. 14; V. 1 | 5; A. 2 | 8; C. 175-5.[2]