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Show 134 MR. G. A. BOULENGER ON THE AFRICAN AND [Feb. 7, spines equal in length from the fourth or fifth; soft rays produced, the longest twice as long as the longest spines. Pectoral obtusely pointed, | to | length of head, not extending to origin of anal. Ventral reaching origin of anal. Anal III 6-7 ; third spine as long as longest dorsal. Caudal rounded. Caudal peduncle as long as deep. Scales ctenoid, 29-30 ~ ; lat. 1. j | ^ . Yellowish, uuiform or Avith 8 or 9 dark bars. Total length 45 millim. Lower Congo. 51. TILAPIA ACUTICEPS. Chromis acuticeps, Steind. Verh. zool.-bot. Ges. Wien, xvi. 1866, p. 764. Teeth very small, in 2 series. Depth of body a little less than length of head, about 3 times iu total length. Snout with straight upper profile, lg diameter of eye, which is 4 times in length of head and equals interorbital width ; mouth moderate, § Avidth of head; maxillary extending to between nostril and eye; 4 or 5 series of scales on the cheek ; large scales on the opercle. Gill-rakers short, 9 on lower part of anterior arch. Dorsal X I V - XV 10-11; last spine longest, about J length of head and f longest soft rays. Pectoral obtusely pointed, about |- length of head, not extending to origin of anal. Ventral reaching vent. Anal III 8-9 ; third spine nearly as long as last dorsal. Caudal rounded. Caudal peduncle as long as deep. Scales ctenoid, 30 ^ ; lat. 1. -4j^* Yellowish broAvn, with several dark bars ; a black opercular spot; a dark streak from below the eye to the angle of the mouth; vertical fins with small blackish spots, forming oblique streaks on the soft anal. Total length 85 millim. Angola and district of the Victoria Falls. 52. TILAPIA LIVINGSTONII, sp. n. (Plate XL fig. 2.) Teeth in 6 series in both jaws, outer moderately large and bicuspid, inner very small, closely-set, and tricuspid. Depth of body scarcely greater than length of head, 3 times in total length; snout descending in a strong curve, as long as the eye, the diameter of which is 3 | times in length of head and slightly exceeds interorbital width : mouth moderately large, f Avidth of head, extending to below anterior border of eye; 3 or 4 series of scales on the cheek; larger scales on the opercle. Gill-rakers short, 8 on lower part of anterior arch. Dorsal X V I I 9 ; last spine longest, not quite \ length of head, § longest soft rays. Pectoral pointed, | length of head, not extending to origin of anal. Ventral reaching origin of anal. Anal III 8 ; third spine a little shorter than last dorsal. Caudal rounded. Caudal peduncle as long as deep. Scales with strongly denticulate edge, 33 ~ ; lat 1. \j^r Brownish above, Avith 7 dark bars, the first on the nape, the penultimate on |