1899.] SYEIAIV FISHES OF THE FAMILY CICHLIDJE. 113 



on the body and a dark spob just below the upper profile of the 

 caudal peduncle. 



Total length 350 millim. 



Lake of Galilee and Jordan ; Nile ; Lakes Abaya, Eudolf, Albert 

 Edward, and Victoria ; G-allaland ; Senegal ; jN^iger. 



6. TiLAPIA TAIfGANICjE. 



Chromis fanganicce, Giinth. Proc. Zool. Soc. 1893, p. 630, fig. 



Tilapia tanganicce, Bouleng. Tr. Zool. Soc. xv. 1898, p. 5. 



Teeth very small, in 5 or 6 series in both jaws. Depth of body 

 2^ in total length, length of head 2i. Snout with straight upper 

 profile, slightly longer than diameter of eye, which is 3| times in 

 length of head and If in interorbital width ; mouth rather small, 

 f width of head, extending to below nostril ; 3 series of scales on 

 the cheek ; large scales on the opercle. Gill-rakers short, slender, 

 20 or 21 on lower part of anterior arch. Dorsal XVI-XVII 

 11-13 ; spines equal in length from the sixth, measuring 3. length 

 of head and | longest soft rays. Pectoral pointed, a little longer 

 than head, extending beyond origin of anal. Ventral reaching 

 vent. Anal III 9-10; third spine a little shorter than longest 

 dorsals. Caudal truncate, slightly emarginate. Caudal peduncle 

 as long as deep. Scales cycloid, 32-33^9120; ^^^'^-^^i- Olive 

 above, silvery beneath ; soft dorsal with rather indistinct oblique 

 dark streaks. 



Total length 95 millim. 



Lake Tanganyika. 



7. TiLAPIA IJfATAlENSIS. 



Chromis nilotkus, part., Peters, Arch. f. Nat. 1855, p. 267, and 

 Eeise n. Mossamb. iv. p. 23 (1868) ; Pfeffer, Jahrb. Hamb. wiss. 

 Anst. X. 1893, p. 149, pi. iii. figs. 1-4, and Thierw. O.-Afr., Pische, 

 p. 10, fig. (1896). 



Chromis mossamhiciis, part., Giinth. Cat. iv. p. 268 (1862). 



Chromis natalensis, M. Weber, Zool. Jahrb., Syst. x. 1897, p. 147. 



Teeth very small, in 4 or 5 series in both jaws. Depth of body 

 2| to 2| times in total length, length of head 3 times. Snout with 

 straight or shghtly convex upper profile, Ig to 1| diameter of eye, 

 which is 4 to 4| times in length of head and 1^ to 2 in interorbital 

 width ; mouth moderate, f to | width of head; maxillary extending 

 to between nostril and eye ; 2 or 3 series of scales on the cheek ; 

 large scales on the opercle. Gill-rakers short, 17 to 20 on lower 

 part of anterior arch. Dorsal XVI-XVIII 10-12 ; last spine 

 longest, f to 5 length of head, | to | longest soft rays. Pectoral 

 pointed, as long as or a little longer (li) than the head, extending 

 to origin of anal. Ventral reaching vent or origin of anal. Anal 

 III 9-11 ; third spine a little shorter but stronger than last 

 dorsal spine. Caudal truncate or very slightly notched. Caudal 

 peduncle as long as deep or a little longer than deep. Scales 



Peoc. Zool. Soc— 1899, No. VIII. 8 



