44 Mr. C. T. Regan—Classification of 
pharyngeal triangular, with slender pointed uni- or bicuspid 
teeth; upper pharyngeals supported by a rather strong 
apophysis with transverse articular surface formed by the 
parasphenoid. Occipital crest very strong, extending for- 
wards to or in advance of anterior margin of orbits. 
Tanganyika and Upper Congo. 
Two species, C. frontosus and C. demeusii (Paratilapia 
demeusti, Bouleng.). 
16. BouLENGEROOHROMIS, Pellegr., 1904 
(type Paratilapia microlepis, Bouleng.). 
Dorsal XVI-XVII 13-15. Anal IIIT 9-10. Scales cy- 
cloid, small (75-90); two lateral lines. Mouth terminal ; 
maxillary slightly exposed distally ; teeth small, in 4 or 5 
series, conical (outer bicuspid and inner tricuspid in the 
young). Lower pharyngeal subtriangular, with slender bi- 
cuspid teeth. Occipital crest extending forward to end of a 
median excavation of anterior part of frontals ; parietal crests 
confluent with edge of frontals above middle of orbits; 
ethmoid united with vomer by suture; nasal bones slightly 
expanded posteriorly ; praemaxillary processes nearly reaching 
frontals ; maxillary rami rather broad, of even width; pos- 
terior end of parasphenoid slightly raised, bearing a pair of 
transverse facets for articulation of upper pharyngeals. 
Vertebre 383 (16+17) ; third with a pair of inferior 
apophyses which unite below ; pracaudals with parapophyses 
from fourth ; ribs, except the first, on parapophyses. 
Tanganyika. A single species. 
17. Pertssopus, Bouleng., 1898 (type P. microlepis, 
Bouleng.). 
Dorsal XVIII 10. Anal III 8. Scales cycloid, small 
(65) ; two lateral lines. Differs from Boulengerochromis in 
the dentition. Teeth in jaws uniserial, few, stout, with a 
small cusp on each side superiorly. 
Tanganyika. A single species. 
18. HapLocuromis, Hilgend., 1888 
(type Chromis obliquidens, Hilgend.). 
Dorsal XITI-XIX 6-13. Anal III (1V) 6-12. Scales 
usually denticulate, large (28 to 45); two lateral lines. 
Mouth terminal ; jaws opposed ; an outer series of bicuspid 
or conical teeth and one or more inner series of smaller tri- 
cuspid or conical teeth. Lower pharyngeal triangular ; teeth 
