. Bulletin of the British Museum (Natural History). 194 P. H. GREENWOOD scaled on its basal half or a little more. Pectoral fin 23-o-2g-8 (M = 27-4) per cent of standard length, 8i-5-ioo-o (M = 89-3) per cent of head. Pelvics with the first ray noticeably prolonged. Teeth. The outer teeth in H. taurinus show the form (text-fig. 25) which, in Lake Victoria Haplochromis species, is associated with paedophagus habits (Greenwood 1959b). Also, as in those species, the teeth of H. taurinus are deeply embedded in the mucosa of the jaws. In both jaws the basic tooth form is similar, namely a cylindric


. Bulletin of the British Museum (Natural History). 194 P. H. GREENWOOD scaled on its basal half or a little more. Pectoral fin 23-o-2g-8 (M = 27-4) per cent of standard length, 8i-5-ioo-o (M = 89-3) per cent of head. Pelvics with the first ray noticeably prolonged. Teeth. The outer teeth in H. taurinus show the form (text-fig. 25) which, in Lake Victoria Haplochromis species, is associated with paedophagus habits (Greenwood 1959b). Also, as in those species, the teeth of H. taurinus are deeply embedded in the mucosa of the jaws. In both jaws the basic tooth form is similar, namely a cylindrical neck and lower crown, but with a markedly compressed, chisel-like bicuspid upper crown. Upper jaw teeth have a crown in which the minor cusp is distinct and the major cusp is obliquely truncate ; the entire crown is curved in- wards. Lower jaw teeth have the major cusp very obliquely truncate, the minor cusp distinct and the entire crown has a slight but definite outward inclination. The posterior third to half of the premaxilla is edentulous ; the toothed part of the bone carries 32-48 (M = 36) Fig. 25. H. taurinus. Teeth, (a) Premaxillary teeth (right), anterior in position. Viewed laterally- (b) Dentary teeth (right), anterolateral in position. Viewed from a point slightly anterior of lateral. Scale = 0-5 mm. The inner teeth in both jaws are small and tricuspid, and are arranged in i or 2 rows. Like the outer teeth, those of the inner rows are deeply embedded in the mucosa. Osteology. The neurocranium of H. taurinus is of the generalized Haplochromis type. The premaxilla and dentary are also basically of a generahzed type, the pre- maxilla not therefore showing the relative elongation of its ascending process (as occurs in some Lake Victoria paedophages, H. parvidens). Thus, in all syncranial features H. taurinus is comparable with the less specialized embryo and larval fish- eating species of Lake Victoria, viz. H. maxillaris and H. obesus. The lower pharyng


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