tli« Family Clchlidse. 37 



C. Scales large ; 3 anal spines ; teeth strong, compressed. 

 Teeth hi- or triserial, distally expanded and 



truncate 33. Eretmodus. 



Teeth uuiserial, distally slightly expanded and 



rounded 34. Spathodus. 



D. Scales large or small ; 4 to 10 anal spines ; a hand of small 



teeth and an outer series of conical teeth, the anterior strong. 



1. Inner teeth tricuspid 35. Telmatochromis. 



2. Inner teeth conical ; suborbitals ligamentous. 



36. Jididochromis. 



3. Inner teeth conical ; suborbitals ossified. 



37. Lamprologus. 



1. Tylocheomis, gen. nov. 

 (type Pehnatochromisjentinhij Steiud.). 



Dorsal XIII-XVI 12-17. Anal III 7-9. Scales cycloid 

 or finely denticulate, large or ratlier small (30-60) ; two 

 lateral lines, tlie lower extending far forward. Mouth 

 terminal ; teeth conical, in 2 to 5 series. Lower pharyngeal 

 triangular, with slender pointed teetli at least near the 

 posterior angles and large rounded flat teeth in the middle 

 at least posteriorly. Posterior part of parasphenoid with a 

 strong apophysis ending in a flattish triangular or broadly 

 ovate surface for articulation of upper pharyngeal. Vertebrae 

 29-32 (15-16 + 14-16) ; third with inferior apophyses uniting 

 to form a strong median spine. 



Tanganyika; Congo ; Gambia to Liberia. 



The Tanganyika species {T. polylepis) differs from its 

 congeners in the smaller scales (55 to 60 instead of 30 

 to 45). 



2. TiLAPlA, A. Smith, 1840 (type T. sparrmanni, K.^m\i\\). 



Dorsal XI-XVIII 9-16. Anal III-IV (V-VI) 7-] 2. 

 Scales cycloid or feebly denticulate, large (26-36) ; two 

 lateral lines. Mouth terminal ; maxiUary concealed or 

 slightly exposed distally ; teeth in jaws in several series, the 

 outermost typically bicuspid (some often uni- or tricuspid), 

 rarely all conical ; inner series typically tricuspid, some 

 occasionally unicuspid in adults. Lower pharyngeal tri- 

 angular or heart-shaped, with slender or moderately stout 

 uni-, bi-, or tricuspid teeth. Occipital crest extending 

 forward to posterior end of a median excavation of anterior 

 ])art of frontals; parietal crests extending forwards at least 

 to between the orbits ; nasal bones strongly expanded 

 posteriorly ; prajmaxillary processes stout, much expanded 



