It is my intention this evening to direct the attention of the members of the club to four closely allied genera of diatomaceæ which have recently been found on that part of the Northumberland coast which is in close contiguity to the Mouth of the Tyne. Two of the genera are well known to microscopists ; one has only recently been discovered and named by Dr. Donkin, and the other, which was discovered by Dr. Donkin, and enrolled by him among the Pleurosigmata, was finally constituted into a new genus, and named by Mr. Ralfs, Donkinia, in honour of its discoverer.

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