V.—On the Occurrence of Xanthidia (Spiniferites of Mantell) in the London Clay of the Isle of Sheppey

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Abstract
The vexed question of the affinities of the fossil organisms known as Xanthidia—a question which only experienced zoologists and botanists can hope to solve—will not be discussed in this short paper, my intention being merely to show that these interesting organisms are not confined (in England) to the Chalk flints and Grey Chalk, but exist in the London Clay, and to give a short account of the means of isolation and of the appearance of these minute fossils.

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