. Bulletin of the British Museum (Natural History), Geology. BRITISH WEALDEN SHARKS. 2 mm Fig. 7. Hybodus parvidens Smith Woodward. An anterior (a) and a posterior (b) tooth in labial (i), lingual (2) and medial (3) view. , Ashdown Beds, Cliff End Bone-bed ; ClifiE End, Sussex. lower (I-5-I-7) than is usual in Wealden teeth. The striae on the labial face of the central cusp reach the tip in only four of the eighteen teeth : in six they cover between two-thirds and three-quarters of the cusp, in four about half the cusp, and in four less than half. Also, there is no accessory cusp at
. Bulletin of the British Museum (Natural History), Geology. BRITISH WEALDEN SHARKS. 2 mm Fig. 7. Hybodus parvidens Smith Woodward. An anterior (a) and a posterior (b) tooth in labial (i), lingual (2) and medial (3) view. , Ashdown Beds, Cliff End Bone-bed ; ClifiE End, Sussex. lower (I-5-I-7) than is usual in Wealden teeth. The striae on the labial face of the central cusp reach the tip in only four of the eighteen teeth : in six they cover between two-thirds and three-quarters of the cusp, in four about half the cusp, and in four less than half. Also, there is no accessory cusp at the base of the central cusp in any of the teeth, though there is an incipient cusp in two of them (Text-fig. 8b) . But in spite of these differences, I have little doubt in referring these teeth to H. parvidens : the examples with lower crowns exactly match those typical H. parvidens in which the accessory cusp is 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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