On some Fossils from the “Menevian Group”.

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Abstract
D escription of some of the principal fossils of the Menevian formation, including the large Paradoxides ( P. Davidis ), appeared in the Quarterly Journal of the Society for August 1864, and others in the number for November 1865; but as many new forms have been obtained since then, a large number yet remain to be described. The continued research, carried on by one of the authors, in the typical locality, St. David's, has been the means of discovering the whole of these new forms, many of which, however, have been subsequently found in various other places. Around the Merionethshire anticlinal ridge of Lower Cambrian rocks large collections have been made:—on the north side, near Maentwrog, and at Tafarn Helig, near Trawsfynydd, by Messrs. D. Homfray and R. A. Eskrigge; and on the south side near Dolgelly by Messrs. T. Belt, E. Williamson, J. Plant, and J. C. Barlow,—all of whom have also done something towards defining the boundaries of the group in North Wales. Much also has been done by us, in like manner, in South Wales, and many new localities have been found to be occupied by this interesting group. The range of some of these fossils has been more clearly ascertained, and greatly extended. They are not in any way limited to the black Lower Lingula-shales, but occur also in the hard grey rocks which form the upper bands of the Harlech grits. One of the authors has recently found both Trilobites and Shells in a series of red and

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