328 ADDENDA, VOL. III. 



little greater than prseorbital depth ; mouth rather small, \ width of 

 head, extending a little beyond vertical of nostril ; teeth with very 

 slender shafts, in 3 series, 60 to 64 in outer series of upper jaw ; 3 series 

 of scales on the cheek, width of scaly part less than diameter of eye. 

 Gill-rakers rather short, 16 to 18 on lower part of anterior arch. 

 Dorsal XVI 13 ; spines equal from the sixth, not quite \ length of 

 head ; longest soft rays \ length of head. Anal III 12 ; third spine 

 ^ length of head. Pectoral as long as head, nearly reaching vertical of 

 origin of anal. Ventral produced into a filament, extending a little 

 beyond origin of anal. Caudal with deep, crescentic emargination. 



91 



Caudal peduncle deeper than long. Scales cycloid, 33-35 j^ ; lateral 

 lines \y Golden, brownish on the back with faint traces of darker bars ; 

 a blackish opercular spot ; dorsal fin with blackish streaks and marblings, 



Fig. 190. 



l'i lapia ca udomarginata . 

 Type. 



and a large black spot on the anterior soft rays ; caudal broadly edged 

 with blackish. 



Total length 78 millim. 



Sierra Leone. 

 1-2. Types. N. Sherbo district. N. W. Thomas, Esq. (P.). 



Distinguished from the young of T. heudeloti by smaller scales, more 

 numerous anal rays, and the deeply emarginate caudal. 



17. TILAPIA MACROCEPHALA, Blkr. 

 Add :— • 

 65. Ad. Maka, Sierra Leone. N. W. Thomas, Esq. (P. ). 



