TILAPIA. 159 



8. TILAPIA LINNELLL 

 Tilapia (GepJii/rocliromis) li)mellii, Liinnb. Ann. & Mag. >i. H. (7) xii. 1903, 

 p. 42. 

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

 24 times. Head twice, or a little over twice, as long as broad, upper 

 profile nearly straight; snout rounded, as long as postocular part of 

 head ; eye 5 times in length of head, 1| times in interorbital width, 

 equal to prseorbital depth ; mouth rather large, | width of head, 

 extending to between nostril and eye ; teeth in 6 or 7 series, outer 

 (about 100 in upper jaw) conical * ; 2 series of scales on the cheek, 

 width of scaly part less than diameter of eye. Gill-rakers short, 16 on 

 lower part of anterior arch. Dorsal XV 12-13 ; last spine longest, not 



* In view of variations in other species, I doubt whether the conical condition of the 

 outer teeth will prove a constant character, although Prof. Ldnnberg has had as many as 

 eight specimens at his disposal. 



