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Show 718 DR. A. GUNT1IER ON FISHES [June 6, appearance of large spots ; the foremost of these spots is the one on the operculum. A series of black spots along the base of the dorsal fin, each spot covering the base of a spine; another less complete submarginal series. One specimen, 130 millim. long, from the Kotchwah River. This species is closely allied to the one which I have identified (with doubt) with Hemichromis schwebischi, Sauvage (Ann. & Mag. N.H. 1896, xvii. p. 273), and which Mr. Boulenger-after comparison with the type of the latter-declares to be distinct, describing and figuring it under the name Chromidotilapia Jcings-legce, P. Z. S. 1898, p. 151, pl. xix. fig. 2. Some of the front teeth of the Kotchwah specimen are bent inwards, though not quite so conspicuously as in the larger of the specimens of Chromidotilapia (96. 5. 5. 38) ; but 1 cannot attach any value to this supposed generic character, as a younger specimen of Chromidotilapia kingsleyce (119 millim. long ; 96. 5. 5. 36) has the teeth much less strongly bent than the older one. CHRYSICHTHYS. Chrysichthys, Octonematichthys, Melanodactglus, Bleeker (1858). Chrysichthys Giinther (1864). Mr. Walker's collection contained a number of specimens of this genus, which evidently belonged to se\eral species. In order to name them, and to compare them with others from previous collections with the determination of which I did not feel satisfied, I have been led to revise the whole of the material which I had brought together for the British Museum collection. The following notes on the several species are the results of this examination. I paid special attention to the disposition of the teeth on the palate, and I convinced myself that I was right (Cat. Fish. v. p. 70) in declining to use modifications, which in some of the species are subject to individual variation, for the establishment of genera, as has been done by Bleeker. I have also questioned the propriety of separating Clarotes from Chrysichthys, stating m y reasons (pp. 71, 73), which, however, weighed so little with that ichth \ ologist that he placed these genera iu the ' Atlas Ichthyologique ' into two distinct groups, separated by forms like Doras, Synodontis, &c. CHRYSICHTHYS AURATUS (Geoffr.). Chrysichthys auratus Giinth. Cat. Pish. v. p. 71. I refer, for the present, to this species a young specimen, 150 millim. long, from the River Prah, as well as several stdl younger ones from the River Offim. The eye of these young specimens is, of course, larger than in an adult example from the Nile, the only-one I have for comparison. Also the skin on the upper surface of tbe head is much less thick, which, again, may be accounted for by the difference in age. On the other hand, there are many |