. Bulletin of the British Museum (Natural History), Geology. 290 BRITISH WEALDEN SHARKS It is possible that the suspension was amphistyhc, but the long, large hyomandibular shows that the species tends towards the hyostylic condition. Smith Woodward describes the dentition of H. basanus as consisting of ten or eleven paired files of teeth in each jaw, with a symphysial file in the mandible. The teeth (Text-fig. i) have a high, slender central cusp and three pairs of lateral cusps which are well separated from the central cusp. The height of the central cusp (above the root/crown junction) is o
. Bulletin of the British Museum (Natural History), Geology. 290 BRITISH WEALDEN SHARKS It is possible that the suspension was amphistyhc, but the long, large hyomandibular shows that the species tends towards the hyostylic condition. Smith Woodward describes the dentition of H. basanus as consisting of ten or eleven paired files of teeth in each jaw, with a symphysial file in the mandible. The teeth (Text-fig. i) have a high, slender central cusp and three pairs of lateral cusps which are well separated from the central cusp. The height of the central cusp (above the root/crown junction) is only slightly less than the length of the tooth in anterior teeth, but the height decreases posteriorly. The central cusp curves lingually rather strongly, but the tip curves labially again, giving a weakly sigmoid outline to the cusp in medial view (Text-fig. ib). Of the three pairs of lateral cusps, the innermost is sharply pointed, striated to its tip, and normally about one-third as high as the central cusp. The second pair of lateral cusps is shorter but similarly ornamented. The outermost cusps are normally very small and almost smooth. A minute fourth lateral cusp is occasionally 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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