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Show 1893.] FISHES FROM LAKE TANGANYIKA. 631 of the scaly portion of the cheek, but is less than the width of the interorbital space, which is nearly flat. The two limbs of the praeoperculum meet at a right angle; the height of the body is contained twice and a fourth in the total (without caudal), the length of the head twice and four fifths ; the longest dorsal spine Chromis tanganicce. is less than one half of the length of the head. Caudal scaleless. Pectoral fin extending beyond the origin of the anal. Scales with concentric rough undulating ridges. Coloration uniform greenish with silvery reflections. Three specimens. CHROMIS BURTONI, sp. n. (Plate LVIII. fig. C.) D. -Q. A. 9. L. lat. 27. L. transv. -§•• Teeth small, each with a small outer cusp, twenty-eight on each side of the outer series of the upper jaw. Scales below the eye in four or five series. In a specimen nearly 4 inches long the diameter of the eye equals the width of the praeorbital and of the interorbital space, which is slightly convex transversely, but has a concave longitudinal profile; the depth of the scaly portion of the cheek is distinctly more than the width of the orbit. The angle formed by the praeopercular limbs is a right one. The height of the body is rather more than the length of the head, which is one third of the total (without caudal). The length of the last dorsal spine is two fifths of that of the head; caudal with convex PROC. Z O O L . Soc-1893, N o . XLIII, 43 |
