TILAPIA. 201 



largest, 50 to 60 in upper jaw, and separated from the othersby a rather 

 wide interspace ; 3 series of scales on the cheek, width of scaly part 

 equal to diameter of eye. Gill-rakers short, 10 on lower part of anterior 

 arch. Dorsal XV-XVI 11-12 ; last spine longest, about I length of 

 head; middle soft rays about f length of head. Anal III 8; third 

 spine shorter than longest dorsal. Pectoral slightly shorter than head, 

 not extending to vertical of origin of anal. Ventral reaching vent or 

 anal. Caudal truncate. Caudal peduncle as long as deep. Scales 

 26-29 jyTYi ; lateral lines j^. Males brownish above and black or 

 blackish beneath, females whitish beneath ; faint traces of four or five 

 dusky bars sometimes present on the body ; a black opercular spot ; 

 soft dorsal with a large basal black spot, with or without roundish light 

 spots, which may also be present on the upper half of the caudal. 



Total length 140 millim. 



Barombi-ba-kotta, a small isolated lake of volcanic origin on the 

 Cameroon Mountain. — Types in Stockholm Museum. 



1-2. Two of the L. Barombi-ba-kotta. Dr. G. Linnell (G.) ; 



types. Prof. E. Lonnberg (P.). 



36. TILAPIA GUINEEiVSIS. 



Chromis guineensis (Bleek.), Giinth. Cat. Fish. iv. jip. 271 & 510 (18C2). 



CJiromis tristrami part., Giinth. t. c. j\ 269. 



Ilalvjenes guineensis, Bleek. Nat. Verh. Vet. Haarlem, xviii. 1863, no. 2, p 41, 



pi. vii. 

 Tilapia guineensis, Bouleng. Proc. Zool. Soc. 1899, p. 124 ; Pcllegr. M^m. See. 



Zool. France, xvi. 1904, p. 333. 



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

 times. Head twice as long as broad; snout deep, with steep upper 

 profile, a little broader than long, IJ to 1\ times as long as eye, shorter 

 than postocular part of head ; eye 4 times in length of head, 1 J times in 

 interorbital width, equal to or a little less than depth of prgeorbital ; 

 mouth rather large, f to f width of head, extending to below anterior 

 border of eye or not quite so far ; teeth in 4 series, outer largest, 

 about 50 in upper jaw, and separated from the others by a rather wide 

 interspace ; 4 series of scales on the cheek, width of scaly part at least 

 equal to diameter of eye. Gill-rakers short, 11 or 12 on lower part of 

 anterior arch. Dorsal XV-XVl 11-13 ; last spine longest, ftof length 

 of head ; middle soft rays much produced, much longer than head. 

 Anal III 9; third spine shorter than longest dorsal, soft rays produced 



