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Show 110 MR. G. A. BOULENGER ON THE AFRICAN AND [Feb. 7, B. Third anal spine longer than longest dorsal spine. 1. Head 2f to 3 times in total length ; D. XIII-XIV 10-13; A. Ill 7-9. a. Soft dorsal rays much shorter than head; gq. 32-34 M 59. oligacanthus Blkr. b. Middle soft dorsal rays produced, at least 4_5 as l o nS as head- [Sauv. Sq. 32-34 1 4 _ j 5 60. madagascariensis Sq. 35 ~ 61. grandidieri Sauv. 2. Head 3^ times in total length ; D. XIV-XV 12-13; A. Ill 10; middle soft dorsal and anal rays produced ; Sq. 31-33 ^ 62. betsileana Blgr. 1. TILAPIA HUNTERI. Oreochromis hunteri, Giinth. Proc. Zool. Soc. 1889, p. 70. Teeth very small, in 7 or 8 closely-set series in both jaws. Depth of body equal to length of head, 3|- times in total length. Snout Avith concave upper profile, nearly twice diameter of eye, which is 5 times in length of head and tAvice in interorbital width; mouth rather large, nearly f width of head; maxillary extending to betAveen nostril and eye; 3 series of scales on the cheek. Dorsal X V I I 11; last spine longest, 5 length of head, \ longest soft rays. Pectoral pointed, a little shorter than the head, not extending to origin of anal. Ventral reaching vent. Anal I V 10 ; fourth spine longest, a little shorter than last dorsal. Caudal truncate. Caudal peduncle a little longer than deep. Scales cycloid, 35 i,; lat. 1. ^. Dark broAvn, tinged with rusty ; A-ertical fins and ventrals blackish, Total length 300 millim. Crater Lake, Kilimandjaro. 2. TILAPIA NIGRA. Greochromis niger, Giinth. Proc. Zool. Soc. 1894, p. 89, pi. ix. Teeth very small, in 4 or 5 closely-set series in both jaAvs. Depth of body 2\ to 2 | in total length, length of head 3 to 3^ times. Snout with straight upper profile, nearly tAvice diameter of eye, which is 5 to 5^ times in leugth of head and 2 to 2\ in interorbital Avidth ; mouth rather large, § to J Avidth of head; maxillary extending nearly to below anterior border of eye ; 2 or 3 series of scales on the cheek. Gill-rakers short, 17 on lower part of anterior arch. Dorsal X V I I 11-12; last spine longest, not quite h length of head ; middle soft rays much produced, more than twice as long as longest dorsal spine. Pectoral pointed, as long as the head, not extending to origin of anal. Ventral reaching anal. Anal I V 9 ; fourth spine longest, nearly as long as last dorsal; soft rays produced. Caudal truncate or slightly |