. Bulletin of the British Museum (Natural History), Geology. . Fig. 7. hates rhachirhinchus. Vomers, in ventral view, to show variation in the shape of the tooth patch. Information on the ethmoid complex is derived exclusively from a single specimen (Fig. 5) comprising the greater part of the ethmoid, the left lateral ethmoid (virtually intact save for the lateral projection that articulates with the lachrymal bone) and the supraorbital and immediately postorbital parts of the left frontal. Except for a narrow strip along the midline, the right frontal is destroyed. We estimate that these bone
. Bulletin of the British Museum (Natural History), Geology. . Fig. 7. hates rhachirhinchus. Vomers, in ventral view, to show variation in the shape of the tooth patch. Information on the ethmoid complex is derived exclusively from a single specimen (Fig. 5) comprising the greater part of the ethmoid, the left lateral ethmoid (virtually intact save for the lateral projection that articulates with the lachrymal bone) and the supraorbital and immediately postorbital parts of the left frontal. Except for a narrow strip along the midline, the right frontal is destroyed. We estimate that these bones are from a skull c 12 cm long. The mesethmoid differs little from that in extant species, apart from its marked lateral compression, in which feature, as might be expected, it resembles Luciolates stappersi, another narrow-skulled form. Also, in L. rhachirhinchus the two dorsal projections underlying the derm ethmoid are, as compared with all living forms, reduced to mere laterally directed and low ridges with no forward projection at all. In extant taxa the projections are horn-like and extend forward well beyond the outline of the median ethmoidal ridge. The lateral ethmoid compares closely with that bone in L. niloticus except that it is much less extensive laterally and does not stand away from the skull as a distinct bony shelf. In this respect L. rhachirhinchus differs markedly from Luciolates and the endemic Lake Tanganyika species of Lates. In these the lateral ethmoid not only extends laterally but also downwards and backwards, giving the appearance in lateral view of a solid triangular wedge linking the vomer with the orbital Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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