OCR Text |
Show 126 MR. G. A. BOULENGER ON THE AFRICAN AND [Feb. 7, Chromis microcephalus (non Bleek.), Sauvage, Bull. Soc. Zool. France, 1884, p. 196, fig. Chromis ogowensis, Giinth. Ann. & Mag. N. H. (6) xvii. 1896, p. 271. Teeth small, in 3 to 5 well separated series in both jaws. Depth of body 2 to 2k in total length, length of head 3 to 3^ times. Snout with straight or convex upper profile, \\ to lg diameter of eye, which is 3| to 4 times in length of head and \\ to 11 in interorbital width ; mouth f to § Avidth of head ; maxillary extending to between nostril and eye; 3 or 4 series of scales on the cheek; large scales on the opercle. Gill-rakers very short, 10 to 12 on loAver part of anterior arch. Dorsal X V - X V I 10-14; last spine longest, nearly | length of head, | to \ middle soft rays, which are produced in the adult. Pectoral as long as or a little longer than the head, extending as far or nearly as far as origin of anal. Outer ventral ray produced, reaching origin of anal or beyond. Anal III 9-10; third spine shorter than last dorsal. Caudal truncate or slightly emarginate. Caudal peduncle a little deeper than long. Scales cycloid, 29-31 yf^|; lat. 1. jy^p. Olive-broAvn, with or AA*ithout 4 or 5 very indistinct darker bars ; a black temporal spot; dorsal fin with blackish streaks and a large black spot betAveen the anterior soft rays, the streaks behind the spot very oblique. Total length 175 millim. West Africa, from the Gambia to the Loango. 35. TILAPIA RANGII. Tilapia rangii, A. Dum. Arch. Mus. x. 1859, p. 255. Chromis rangii, Bochebr. Actes Soc. Linn. Bord. (4) vi. 1883. p. 133. Depth of body 2| in total length. 3 series of scales on the cheek. 14 gill-rakers on lower part of anterior arch. Dorsal X V 10. Anal III 8. Pectoral extending beyond origin of anal. Caudal truncate. Scales cycloid, 26 £. A black opercular spot; small blackish spots on the soft dorsal. Total length 100 millim. Gorea. 36. TILAPIA RENDALLI. Chromis rendalli, Bouleng. Proc. Zool. Soc. 1806, p. 915, fig. Tilapia rendalli, Bouleng. Tr. Zool. Soc. xv. 1898, p. 4. Teeth rather small, forming 4 transverse series Avell separated from each other. Depth of body 2\ to 2| in total length, length of head 3 to 3^ times. Snout Avith steep, slightly convex upper profile, a little longer than the eye, the diameter of Avhich is 4 times in length of head and li in interorbital Avidth ; mouth about | width of head; maxillary not extending quite to below anterior border of eye; 4 series of scales on the cheek ; large |