the Upper and the top of the Lower Silurians, whilst in others a real or apparent unconformity occurs. He expressed much surprise at some of the fossils from the Mudstones, and remarked that Trinucleus fimbriatus is a true Lower-Silurian form.
Mr. Etheridge remarked that, as many geologists have worked over the area referred to in the paper, and have differed so much in their results, it is very difficult to come to any definite conclusion. The Mudstones possess a fauna belonging to the Caradoc beds and low down in the Bala series. He agreed with Prof. Hughes that there are more than one series of pale slates. It occurred to him that there must be some mistake in the determination of the species in the Graptolitic Mudstones; and yet all the interest of the paper hinges upon them. The Coniston Limestones have a well-recognized position.
