4G I^Ir. ('. T. Rognn — Classification of 



outwards. Lower pliarynj^eal tiiano-iilar, with small slender 

 toflli. Ski'letoii very similar to that of CaUorhromis ynacrops, 

 but the jiraMiiaxillary processes shorter, not reaching frontals; 

 vertebrai 3G (17 + 19). 



Tanganyika ; a single species. 



20. Callochromis, gen. nov. 

 (type Felmatochromis macrops, Bouleng.). 



Dorsal XIT-XVI 10-1-4. Anal III 6-9. Outermost ray 

 of pelvic till loiij^est. Scales denticulate, large (32-38) ; two 

 lateral lines. Mouth small, terminal or subterminal, nearly 

 horizontal ; end of maxillary slightly exposed ; jaws with 

 narrow bands of small conical teetli, the outer on sides of 

 lower jaw enlarged and directed more or less outwards. 

 Lower pharyngeals united by interlocking suture to form a 

 triangular plate; enlarged blunt rounded teeth in the middle 

 ])Osteriorly and slender bicuspid teeth elsewhere. Occi|)ital 

 crest ending above middle of orbits behind a groove on 

 frontals that widens forwards ; parietal crests ending above 

 posterior part of orbits ; prmmaxillary processes extending to 

 between orbits; niaxillary broadest below palatine articula- 

 tion, distal part shoit and broad ; ethmoid united with vomer 

 by suture; nasals much expanded posteriorly; posterior part 

 of parasphenoid slightly raised, convex ; articular surface for 

 upper pharyngeals formed by parasphenoid in the middle and 

 basioceiintal at the sides. VertebriO 34(10 + 18); inferior 

 apophyses of third vertebra" uniting below to forn) a median 

 spine. 



Tanganyika ; four species. 



21. Leptociiromis, gen. nov. 

 (type Faratilapia ca/liura, Bouleng.). 



Dorsal XVI-XVII 10. Anal III 7-S. Scales denticu- 

 late, large (37—10); two lateral lines. Mouth terminal, very 

 protractile; maxillary broad, slightly exposed ; jaws with an 

 outer series of very small conical teeth and 1 or 2 inner 

 series of minute teeth. Interorbital region narrow. Lower 

 pharyngeal small, triangular, with long anterior blade; teeth 

 small, slender. Occipital crest ending at posterior part of 

 interoibital region behind a long groove on the narrow 

 frontals ; parietal crests not extending forwards on frontals; 

 ethmoid in contact with vomer; a thin-walled otic bulla; 

 aitieular surface for upper pharyngeals formed by para- 

 sphenoid in the middle and basioccipital ut the sides. 



