The occurence of certain of the Lower Silurian Rocks of the Lake-district beneath the Scar Limestone of Yorkshire, on a line between Ingleton and Settle, has been long known, and has been noticed both by Professor Phillips (Trans. Geol. Soc. 2nd series, vol. iii. p.1), and by Professor Sedgwick (Quart. Journ. Geol. Soc. vol. viii. p. 35). More recently the rocks in question have been shortly descrobed in a paper by Mr. Hughes, of the Geological Survey (Geol. Mag. Vol. IV. p. 346). Having had the opportunity of visiting Ingleton in company with Professor HArkness, and subsequently alone, I have collected the following brief notes of the Silurian strata which are seen in that locality, and which belong to the Green Slates and Porphyroes of the Lake-district.