TIL A PI A. 



!39 



71. TILAPIA MARTINI. 



Bouleng. Ann. & Mao-. N. H. (7) xvii. 1906, p. 419, Fish. Nile, p. 514, pi. xci. fig. 2 

 (1907), and in Schubotz, "Wiss. Ergebn. Deutsch. Z.-Afr. Exped., Zool. iii. 

 p. 255 (1914). 



Depth of body 2f to 3 times in total length, length of head 2f to 

 3 times ; body deepest at the nape. Head twice as long as broad; snout 

 rounded, broader than long, profile descending in a steep oblique line, 

 shorter than eye, which is 2f to 3 times in length of head, exceeds 

 interorbital width, and equals twice least depth of praeorbital ; mouth 

 not very oblique, extending to below anterior third of eye ; teeth small, 

 in 3 or 4 series, 40 to 70 in outer series of upper jaw ; 4 or 5 series of 

 scales on the cheek, width of scaly part equal to or less than diameter of 

 eye. Gill-rakers short, some T-shaped, 8 or 9 on lower part of anterior 



Fig. 158. 



*Wfa 







Tilapia martini. 

 Type (F. N.). 



arch. Dorsal XV-XVI 8-10 ; spines equal from the eighth or ninth, 

 ^ to f length of head ; longest soft rays 3 to f length of head. Anal 

 III 8-9 ; third spine as long as and stronger than longest dorsal. 

 Pectoral as long as head, reaching beyond vertical of origin of an;d. 

 Ventral reaching origin of anal or a little beyond. Caudal truncate. 

 Caudal peduncle If times as long as deep. Scales feebly denticulate, 

 32-33 Y3-To > lateral lines ^^5. Yellowish olive above, white beneath ; 

 a dark vertical bar below the eye and one or three cross-bars on the 

 head often present ; a blackish opercular spot ; a blackish stripe may 

 extend from the latter to the root of the caudal fin, as well as a second, 

 more or less distinct, higher up on the side of the back ; some specimens 

 uniform dark grey or brownish ; dorsal and anal fins greyish, with more 

 or less distinct round darker spots ; pectoral and anal fins yellow, the 



