50 ^Ir. C. T. Kegan — Chissijication of 



fill. Mouth terminal, very oblique ; end of maxillary ex- 

 posed ; feetli unistyial, conical, curved. Lower pliaryn<ieul 

 triangular, with small slender unicuspid toetli. Skeleton as 

 in llemihates, except that the maxillary has only a small 

 process below the palatine articulation and is broadest 

 distallv ; praimaxillary processes not reaching frontals ; 

 vertebrae 38 (ID + 10), 



Tanganyika ; a single species. 



31* Xenochromis, Bouleng., 1899 

 (type A', hecqui, Bouleng.). 



Dorsal XYI-XYII 10-11. Anal Til 9-10. Scales small 

 (C0-7U) ; two lateral lines, the upper nearly reaching caudal 

 tin. Mouth terminal; end of maxillary exposed ; teeth uni- 

 serial, compressed, a little concave in front, strongly curved, 

 rather small and forming a close-set seriei=. Lower ])haryn- 

 geal triangular, with small unicuspid teeth. Skeleton as in 

 lluplota.vodon, except that the ethmoid is well separated from 

 the vomer. Vertebraj 35 (17 + 18). 



Tanganyika ; a single species. 



32. Plecodus, Bouleng., 1898 

 (lype P. parado.vus, Bouleng.). 



Dorsal XVIII-XX 11-13. Anal III 12-13. Scales 

 small (75-80). Differs from Xenochromis only in having 

 the teeth large, few, and set well apart. 



Tanganyika ; a single species. 



33. Eretmodus, Bouleng., 1898 

 (type E. cyauost'utus, Bouleng.). 



Dorsal XXIII-XXV 3-5. Anal III 6-7. Scales den- 

 ticulate, large (32-35) ; two lateral lines. Teeth rather 

 strong, di.stally expanded, coni])ies.sed and truncate, in 2 or 

 3 series. Lower pharyngeal subtriangular, with small slender 

 teeth. Occipital cre.'-t ending behind a broad and deep de- 

 j)ression on anterior part of skull, formed by fiontals, and in 

 front by ethmoid and lateral ethmoids ; parietal crests ending 

 above posterior part of orbits ; ethmoid separated from 

 vomer ; jaws strong; jjrannaxillary jirocesses stout; maxil- 

 lary broadest distally. Articular surface for upper j)haryji- 

 geals formed by parasphenoid in the middle and basioccijiltal 

 at the sides. Vertebra 30 (15+15); a pair of inferior 



