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Show 122 MR. G. A. BOULENGER ON THE AFRICAN AND [Feb. 7, middle soft rays, Avhich are much produced. Pectoral pointed, as long as head, not extending to origin of anal. Ventral reaching vent or origin of anal. Anal III 10-11 ; third spine shorter than last dorsal; soft rays produced like the dorsals. Caudal rounded. Caudal peduncle deeper than long. Scales cycloid, 3 2 j - ^ ; lat. 1. ^£^. OhVe-brown ; a black opercular spot ; soft dorsal and caudal with numerous small round blackish spots. Total length 340 millim. Loango. 25. TILAPIA MARINE, sp. n. (Plate XI. fig. 1.) Teeth small, in 3 series in both jaws. Depth of body 2 to 2|- iu total length, length of head 2 | to 3 times. Snout with straight upper profile, as long as diameter of eye, which is 3 times in length of head and 1^ to lg in interorbital Avidth ; mouth rather small, f width of head; maxillary extending to between nostril and eye; 4 series of scales on the cheek; large scales on the opercle. Gill-rakers short, 13 on lower part of anterior arch. Dorsal X V I 12 ; spines equal in length from the 5th, | length of head. Pectoral pointed, as long as head, not extending to origin of anal. Ventral produced into a filament, reaching origin of anal. Anal III 10; third spine nearly as long as longest dorsals. Caudal truncate. Caudal peduucle a little deeper than long. Scales cycloid, 30-31 ~ ; lat. 1. j^jg. Pale brown, with 7 or 8 dark bars, five of which extend on the dorsal. Total length 80 millim. Azumine Creek, Opobo River, Niger Delta. Two specimens, collected by Miss Mary Kingsley. 26. TILAPIA HORII. Chromis horii, Giinth. Proc. Zool. Soc. 1893, p. 630, pi. lviii. fig. A. Tilapia horii, Bouleng. Tr. Zool. Soc. xv. 1898, p. 5. Teeth very small, in 4 or 5 series in both jaws. Depth of body 3 to 3g times in total length, length of head 2f to 2-i. Snout with straight upper profile, 1| to 1| diameter of eye, Avhich is contained 4 times in length of head and a little exceeds interorbital width; mouth moderate, § width of head, extending to between nostril and eye ; 3 series of scales on the cheek. Gill-rakers short, 13 on lower part of anterior arch. Dorsal X V I 8-9 ; spines equal from the 5th or 6th, 5 to -| length of head, f to § longest soft rays. Pectoral pointed, § length of head, not extending to origin of anal. Ventral reaching vent or origin of anal. Anal III 6-7 ; third spine slightly shorter than longest dorsals. Caudal rounded, subtruucate. Caudal peduncle a little longer than deep. Scales cycloid, 30-31 ~ 2 ; lat. 1. |£g. Pale olive above, with 7 or 8 very indistinct darker bars ; large irregular brown spots may be |
