the Familij Cichlitla\ 41 



8. Tropheus, Bouleng., 1898 (type T. moorli, Bouleng.). 



Dorsal XX-XXI 5-G. Anal IV-VI 5-7. Scales feebly 

 denticulate, large (28-32). Mouth subtenninal, wide, witii 

 transverse bands of small tricuspid teeth and a series of larger 

 bicuspid teeth in front of them ; sides of prsemaxillaries witli 

 a series of welUditfcrentiated conical teeth. Vertobrie 33 

 (17 + lG). In other characters like Simochromis. 



Tanganyika ; two species. 



9. Opiitiialmotilapia, Pellegr., 1904 

 (type Tilapia hoops, Bouhng.). 



Dor?al XII-XTII 12-14. Anal III 8-10. Scales den- 

 ticulate, large (34-40) ; two lateral lines, the upper nearly 

 reaching caudal fin. Eye lar^e ; snout short and broad; 

 mouth subterminal, wide, nearly transverse ; distal end of 

 maxillary slightly exposed. Teeth in jaws firmly attached, 

 close-set, slender, slightly curved at tip, uni- or tricuspid, in 

 narrow bands; outermost series enlarged. Lower pharyngeal 

 subtriangular, with slender teeth. Parietal crests not ex- 

 tending quite so far forward as occipital crest, which ends 

 above middle of orbits behind a median groove on the frontals 

 N\hich widens out forwards; nasals scarcely broader pos- 

 teriorly than anteriorly ; prse maxillary processes not reaching 

 frontals; maxillary n)oderately broad ; a thin-walled auditory 

 bulla formed by prootic and basioccipital ; posterior part of 

 })aiasphenoid sligiitly raised, bearing a pair of transverse oval 

 facets for articulation of upper pharyngeals. Vertebrae 34 

 (16 + 18) ; third with a pair of inferior apophyses ; prajcaudals 

 with parapophyses from third ; libs in sockets at or near ends 

 of paraj^ophyses. 



'J'anganyika. 



Two species, 0. loops and 0. ventralis [Paratilapia 

 vehtral'is, Boulrng.), tho latter differing from the former in 

 the loss of the lateral cusps of the teetii. 



10. CUNNINGTONIA, Bouleng., 1906 

 (type C. loriffiventralis, Bouleng.). 



Dorsal XIII 13-14. Anal III 8-9. Scales denticulate, 

 large (38-43) . Differs from Opidhuhnotiltipia in the dentition ; 

 teeth in jaws very slender^ movable, tricuspid, in rather 

 broad bands. 



Tanganyika ; a single species. 



