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Rh Pupa, Planorbis, Limnæa, Ancylus, Zua, and Unio. Of these the Hydrobia (marginata) has never been found alive in this country.

Mammalian remains also occur in the gravel, principally towards its base. Including other localities in the neighbourhood of Bedford, besides those already mentioned, but where the gravel is of the same character, remains of the following animals have been found: Ursus spelæus, Cervus tarandus, Cervus elaphus, Bos primigenius, Bison priscus, Hippopotamus major, Rhinoceros tichorhinus, Rhinoceros megarhinus, Elephas antiquus, Elephas primigenius, Equus, and Hyæna spelæa.

Fig. 415.—Biddenham, Bedford

I have already given in the Archæologia full-size figures of two of the implements from the Biddenham pit, which are here reproduced.

Fig. 414, though worked to a wedge-like point, is very massive, weighing something over 1 lb. The butt-end has been roughly