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Show 630 DR. A. GONTHER O N REPTILES A N D [NOV. 7, the head one third of that of the trunk. Coloration either brownish, or light coloured with numerous narrow brown cross-bands. Several specimens, not in a good state of preservation, of which the largest is 6| inches long. MASTACEMBELUS OPHIDIUM, sp. n. D. 31-32/103. C. 7. A. 1/116. Body exceedingly slender, subcylindrical, its depth beiug one third of the length of the head. Rostral appendage very short. Vertical fins continuous, the vent being much nearer to the end of the snout than to the caudal fin. Dorsal spines short and feeble, the distance of the foremost from the operculum being only half the length of the head. Length of the head one third of that of the trunk. Scales minute. Coloration apparently uniform brownish. Several specimens, not in a good state preservation, of which tbe largest is llg inches long. CHROMIS HOREI, sp. n. (Plate LVIII. fig. A.) D. L6. A. 1 L. lat. 28. L. transv. 4. 8 . 6 9 Teeth distinctly bicuspid, the cusps being subequal and slightly tinged with brown ; from twenty-eight to thirty-one on each side of the outer series of the upper jaw. Cheeks naked or only with a few extremely thin scales. In a specimen nearly 5 inches long the diameter of the eye is nearly equal to the depth of the soft part of the cheek and a little less than the width of the praeorbital and of the interorbital space, which is flat. The angle formed by the praeopercular limbs is a right one. The height of the body is somewhat less than the length of the head and one third of the total (without caudal). The longest dorsal spine is the last and is two fifths of the length of the head. Pectoral fin extending to, or nearly to, the origin of the anal. Caudal scaleless. Scales rough, some with the margins ciliated. Body light greenish, with more or less conspicuous incomplete brownish cross-bands on the upper part of the body. The largest specimen has the cheek and snout ornamented with irregular deep brown spots ; the soft dorsal and the caudal fin with scattered ocelli; a milky-white spot between the last two anal rays. Three specimens, the largest 4| inches long. CHROMIS TANGANICJE, sp. n. D- ITS- A- §ko- L- ]at' 32' L-transv- 6&*Jaii3i^r Allied to C. squamipinnis. Teeth small, with an obliquely dilated and notched apex ; thirty on each side of the outer series of the upper jaw ; scales below the eye in three series; in a specimen nearly 4 inches long the diameter of the eye exceeds the width of the praeorbital and the depth |