Abstract
Robert Etheridge, Jnr. (1874a, p. 310), records that the same species of Spirorbis as that in the Lesmahgow Silurian occurs in the North Esk section. The D. J. Brown collection with the specimens referred to is missing at the Royal Scottish Museum; but it would be interesting to know how closely these specimens compare with S. lewisii J. de C. Sowerby from the English Wenlock and Ludlow.

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