Abstract
ATTENTION should have been directed sooner than now to an interesting paper by Messrs. E. Heron-Allen and E. Earland on the species of Verneuilina polystropha and some other Foraminifera (Proc. Roy. Irish Academy, vol. 35, Section B, No. 8, pp. 153–77, 3 pis.). It is in part a contribution to the study of variation in the Foraminifera, and in part an account of certain experiments which, to say the least, are very suggestive to those interested in the problem of species. Variation in Foraminifera may affect the size of the primordial chamber, the plan or arrangement of the chambers, and the external form. The authors also discuss the occurrence of gigantism and nanism, the predominance of the chitinous membrane over the calcareous shell, and the changes involved in a free or adherent mode of life within the same species. The facts seem to the authors to prove the futility of all classifications of Foraminifera based on the external shell, but the difficulty is to find any other basis.
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