50 Mr. C. T. Regan—Classification of 
fin. Mouth terminal, very oblique; end of maxillary ex- 
posed ; teeth uniserial, conical, curved. Lower pharyngeal 
triangular, with small slender unicuspid teeth. Skeleton as 
in Hemibates, except that the maxillary has only a small 
process below the palatine articulation and is broadest 
distally ; premaxillary processes not reaching frontals ; 
vertebree 38 (19+19). 
Tanganyika; a single species. 
31, XENOCHROMIS, Bouleng., 1899 
(type X. hecgut, Bouleng.). 
Dorsal XVI-XVII10-11. Anal III 9-10. Scales small . 
(60-70) ; two lateral lines, the upper nearly reaching caudal 
fin. Mouth terminal; end of maxillary exposed ; teeth uni- 
serial, compressed, a little concave in front, strongly curved, 
rather small and forming a close-set series. Lower pharyn- 
geal triangular, with small unicuspid teeth. Skeleton as in 
Haplotaxodon, except that the ethmoid is well separated from 
the vomer. Vertebre 35 (17+18). 
Tanganyika ; a single species. 
32. PLecopus, Bouleng., 1898 
(type P. paradoxus, Bouleng.). 
Dorsal XVITI-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. cyanostictus, Bouleng.). 
Dorsal XXITI-XXV 3-5. Anal IIT 6-7. Scales den- 
ticulate, large (32-35) ; two lateral lines. Teeth rather 
strong, distally expanded, compressed and truncate, in 2 or 
3series. Lower pharyngeal subtriangular, with small slender 
teeth. Occipital crest ending behind a broad and deep de- 
pression on anterior part of skull, formed by frontals, and in 
front by ethmoid and lateral ethmoids ; parietal crests ending 
above posterior part of orbits; ethmoid separated from 
vomer ; jaws strong; premaxillary processes stout; maxil- 
lary broadest distally. Articular surface for upper pharyn- 
geals formed by parasphenoid in the middle and basioccipital 
at the sides. Vertebre 30 (15+15); a pair of inferior 
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