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 Recent researches of Mr. Howard Fox have extended our palaeontological knowledge of the Devonian tract described by that geologist and embodied in this article, an account of which will be found in the Transactions of the Royal Geological Society of Cornwall (vol. xiii, parts 1 and 2).

The geological map requires a word of explanation. The author would have preferred to leave the Culm measures undifferentiated, but having been divided in the Devonshire map, the editor felt it incumbent to adopt the same system in Cornwall for the sake of uniformity. This differentiation however was not undertaken by the author, who desires to point out that the junction drawn between the Culm measures and the Devonian must not be taken to represent an unconformity as the colouration would suggest. The two small patches of serpentine east of Porthallow have been incorrectly coloured as Silurian. The following errors, moreover, appear in the right-hand column of the index of the map: 'Devonian Red Sandstone' should read 'Devonian killas'; 'Upper Silurian' should read 'Lower Silurian.'