510 



Annals of the South African Museum. 



mouth moderately large, | width of head, extending to below anterior 

 border of eye ; teeth in 6 series, outer moderately large, 40 in upper 

 jaw ; 3 or 4 series of scales on the cheek, width of scaly part less 

 than diameter of eye. Gill-rakers short, 8 ou lower part of anterior 

 arch. 



Dorsal xvii 9 ; last spine longest, not quite | length of head, -| 

 lougest soft rays. Anal iii 8; 3rd spine a little shorter than last 

 dorsal. Pectoral f length of head, not extending to origin of anal. 

 Ventral reaching origin of anal. Caiidal rounded. Caudal peduncle 



as long as deep. Scales strongly denticulate, 33 '^ ; lateral lines 



22-23 

 11-12' 



FIG. 135. Tilapia livinystoni. Type (P.Z.S., 189 ( J). 



Brownish above, with 7 dark bars, the first on the nape, the pen- 

 ultimate on the caudal peduncle, the last at the root of the caudal 

 fin ; two round white spots on the anal fin. 



Total length 73 millim. 



Zambesi (?)." 



26. TILAPIA KIRKHAMI, n. sp. 



Teeth in 4 series, an outer of larger bicuspid teeth, about 50 in 

 number on upper jaw, separated by a narrow interspace from 3 rows 

 of tricuspid teeth. Depth of body *2i times in total length excluding 

 caudal, length of head 3y S times. Head with an obtusely rounded 

 profile, If times as long as broad ; snout with straight upper profile, 

 1-| times as long as broad, a little longer than postocular part of head ; 

 eye 4 T 7 - - times in length of head, | iuterorbital width, ^ least depth of 

 preorbital ; mouth -| width of head, reaching scarcely to vertical of 

 anterior border of eye ; 3 to 4 series of scales on cheek, width of scaly 

 part 1| times diameter of eye. Gill-rakers short, 8 on lower part of 

 anterior arch. 



