126 ME. G. A. BOULEIS^GER ON THE AFRICAN AND [Feb. 7, 



Chromis microcephalus (non Bleek.), Sauvage, Bull. Soc. Zool. 

 Prauce, 1884, p. 196, Jag. 



Chromis ogowensis, Giiuth. 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 2^ in total length, length of head 3 to 3^ 

 times. Snout with straight or convex upper profile, 1| to Ig 

 diameter of eye, which is 3| to 4 times in length of head and 1^ 

 to Ig in interorbital width ; mouth f to § width 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 lower part of anterior arch. Dorsal XV-XVI 10-14 ; 

 last spine longest, nearly | length of head, § to i- 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 on gin 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 jf^; lat. 1. jjip. Olive- 

 broAvn, with or without 4 or 5 very indistinct darker bars ; a black 

 temporal spot ; dorsal fin with blackish streaks and a large black 

 spot between 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 EANGII. 



Tilapia rangii, A. Dum. Arch. Mus. x. 1859, p. 2.55. 



Chromis rangii, Eochebr. 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 

 XV 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. TlI/APTA EENDALLI. 



Chromis rendalU, Bouleng. Proc. Zool. Soc. 18i)6, p. 915, fig. 



Tilapia rendaJli, Bouleng. Tr. Zool. Soc. xv. 1898, p. 4. 



Teeth rather small, forming 4 transverse series well separated 

 from each other. Depth of body 2^ to 2| in total length, length 

 of head 3 to 3^ times. Snout with steep, slightly convex upper 

 profile, a little longer than the eye, the diameter of which is 

 4 times in length of head and 1^ in interorbital width ; mouth 

 about I width of head ; maxillary not extending quite to below 

 anterior border of eye ; 4 series of scales on the cheek ; large 



