. Bulletin of the British Museum (Natural History). 156 P. H. GREENWOOD I-8-2-2 (modal range i-g-2-o) times as long as broad. Posterior tip of the maxilla reaching a vertical through the anterior part of the eye or even to one through the anterior margin of the pupil. A noticeable feature of the snout in H. nigripinnis is the size of the anterior open- ing to the nasal laterosensory canal. The opening is as large as (or almost as large as) the nostril. In most other Haplochromis species from Lake George (and apparently Lake Edward also) the opening to this canal is much smaller than the nostri
. Bulletin of the British Museum (Natural History). 156 P. H. GREENWOOD I-8-2-2 (modal range i-g-2-o) times as long as broad. Posterior tip of the maxilla reaching a vertical through the anterior part of the eye or even to one through the anterior margin of the pupil. A noticeable feature of the snout in H. nigripinnis is the size of the anterior open- ing to the nasal laterosensory canal. The opening is as large as (or almost as large as) the nostril. In most other Haplochromis species from Lake George (and apparently Lake Edward also) the opening to this canal is much smaller than the nostril, and is often difficult to locate. The intestine in H. nigripinnis is long [ca 2-2| times total length) and much coiled on itself. Gill rakers on the first arch are, except for the reduced lower 1-3 and the occasional flattened and anvil-shaped upper 1-3, slender and relatively elongate. There are 8-10 (mode g), rarely 11, rakers on the lower part of this arch. No pseudorakers are developed {see p. 145). Scales. Ctenoid ; lateral line with 30 (), 31 (), 32 () or ^^ () scales, cheek with 2 or 3 (mode) rows. Five to 6^ (mode 5^) scales between the upper lateral line and the dorsal fin origin, 6 or 7 (mode), rarely 5, between the pectoral and pelvic fin bases. Fins. Dorsal with 14 (), 15 () or 16 () spinous and 8 (), 9 () or 10 () branched rays. Caudal generally truncate but weakly emarginate in some fishes ; scaled on its basal half. Pectorals 25-8-3I-3 (M = 29-7) per cent of standard length, 79-5-94-5 (M = 87-3) per cent of head. Pelvics with the first ray sUghtly produced. Teeth. The outer teeth in both jaws (except posteriorly in the upper) are slender, compressed and unequally bicuspid (text-fig. 7). The outline of the major cusp varies from equilateral to isoscelene ; all intergrades may occur in one individual or one type of cusp outline may predominate. The crown is slightly incurved. Posterior teeth in the upper jaw are often either uni
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