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Show 128 MR. G. A. BOULENGER ON THE AFRICAN AND [Feb. 7, a filament, extending beyond origin of anal. Anal III 9 ; third spine a little shorter than longest dorsals. Caudal rounded. Caudal peduncle a little longer than deep. Scales cycloid, 29 ^ ; lat. 1. jg. Olive, a dark opercular spot; two dark bars across the upper surface of the snout; a dark streak behind the eye. Total length 95 millim. Lake Tanganyika. 39. TILAPIA BUETTIKOFERI. Chromis biittikoferi, Hubrecht, Notes Leyd. Mus. iii. 1881, p. 66 ; Steind. op. cit. xvi. 1894, p. 391 Teeth rather large (10 on each side in the outer row of the upper jaw). Depth of body 2 to 2\ in total length, length of head 3 to 3|. Snout as long as the eye, which is contained 3 times in length of head; 5 or 6 series of scales on the cheek. Gill-rakers short, 11 on lower part of anterior arch. Dorsal X I V - X V 15-16. Pectoral as long as or a little shorter than the head, not extending so far as origin of anal. Ventral prolonged into a filament, extending beyond origin of anal. Anal H I 10-11. Caudal rounded (?). Scales cycloid, 29-30 i ± . hit. 1. g g . 8 dark bars, the first two across the head, the last two on the caudal peduncle; these bars a little broader than the spaces between them. Total length 105 millim. St. Paul's River, Liberia. 40. TILAPIA POLYCENTRA. Tilapia poly centra, A. Dum. Arch. Mus. x. 1859, p. 254. Chromis polycentra, Giinth. Cat. iv. p. 270 (1862). Depth of body 2| in total length. 3 series of scales on the cheek. 9 gill-rakers on lower part of anterior arch. Dorsal XVIII 8. Anal III 7. Caudal rounded. Scales cycloid, 24 Z-S. Scales finely dotted with blackish ; soft dorsal Avith alternating series of dark and light spots and a large black spot in front. Total length 100 millim. Gorea. 41. TILAPIA KIRKI. ? Ctenochromis strigigena, Pfeffer, Jahrb. Hamb. wiss. Anst. x. 1893, p. 155, pi. ii. figs. 5-8. Chromis kirkii, Giinth. Proc. Zool. Soc. 1893, p. 624, pi. lvi. fig. A (1894). ? Chromis strigigena, Pfeffer, Tbierw. O.-Afr., Fische, p. 18, fig. (1896). 1 I am indebted to Dr. van Lidth de Jeude for notes supplementing the descriptions quoted. |
