. Bulletin of the British Museum (Natural History) Zoology. . Fig. 14 PBO of A, Neomyxus leuciscus (BMNH : 13, 200 mm SL), in lateral and ventral views (valve open forward); B, Chaenomugil proboscideus (: 278-9, 185 mm SL); C, Chelon labrosus (: 746, 107 mm SL). Lateral views of right side. ventrally; sulcus diagonal and narrow, with a large fleshy, papillate valve and smaller ventral valve at lower end. OEDALECHILUS Fowler, 1903 (Fig. 15): PBO with rela- tively small denticulate area, cushions widely separated, distal teeth evenly graded; sulcus diagonal, narrow, wi
. Bulletin of the British Museum (Natural History) Zoology. . Fig. 14 PBO of A, Neomyxus leuciscus (BMNH : 13, 200 mm SL), in lateral and ventral views (valve open forward); B, Chaenomugil proboscideus (: 278-9, 185 mm SL); C, Chelon labrosus (: 746, 107 mm SL). Lateral views of right side. ventrally; sulcus diagonal and narrow, with a large fleshy, papillate valve and smaller ventral valve at lower end. OEDALECHILUS Fowler, 1903 (Fig. 15): PBO with rela- tively small denticulate area, cushions widely separated, distal teeth evenly graded; sulcus diagonal, narrow, with fleshy valve and ventral finger-like process at lower end. This description applies to the type species, O. labeo, but in O. labiosus, the denticulate area is large, with abruptly graded distal-type teeth, those on the sulcus border being larger while those anterolaterally are posteriorly curved; sulcus border slightly concave, elevated dorsoposteriorly; sulcus nearly vertical, wide and with single large valve at lower end (Fig. 15B). MUGIL Linnaeus, 1758 (Figs 16 & 17): In the type species, Mugil cephalus, from the Mediterranean, the PBO has a large denticulate area with finely size-graded teeth, those along the sulcus border being the largest; sulcus wide, near vertical, with a single large valve at lower end. In M. cephalus from other geographical areas there are marked differences in the sulcus and in valve size. Indeed, there seems as much intra- as interspecific variability in the organ, which casts doubt on the specific integrity of M. cephalus. Species with a PBO morpho- logy similar to that in M. cephalus are M. bananensis (with finer teeth; Fig. 16F), M. curema, M. trichodon and M. incilis (Fig. 16G). In M. capurii the denticulate area is larger and bears longer, setiform teeth; the sulcus valve is triangular. Mugil liza has only a moderate denticulate area and a diagonal sulcus with small valve (cf. M. cephalus of Indian Ocean, Fig. 16A), features in whic
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