On the Discovery of Trilobites in the Upper Green (Cambrian) Slates of the Penrhyn Quarries, Bethesda, near Bangor, North Wales

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Abstract
The Cambrian rocks of Wales, once so barren of all evidence of organic remains, have now, thanks to the late Mr. J. W. Salter and Mr. T. Belt, to Mr. Homfray of Portmadoc, but most of all to the researches of Dr. Henry Hicks, F.R.S., at St. Davids and elsewhere, become peopled with an extensive series of organisms, amongst which the Trilobites make up a large proportion of the fauna* It is true that the Longmynd Group elsewhere had only yielded Annelide-burrows and a portion of a Trilobite ( Pal#x0153;opyge Ramsayi ); but the investigations of Dr. Hicks at St. Davids have contributed a Sponge ( Protospongia major ), two Ostracods ( Leperditia cambrensis and L. Hicksii ), eight Trilobites ( Agnostus cambrensis, Plutonia Sedgwickii, Paradoxides Harknessi, P. aurora, P. Hicksii, Conocoryphe Lyelli, C. bufo, Microdiscus sculptus ); in addition to which two Lingulellœ and two Thecœ must be added. The following table shows the fauna of each formation, from the Longmynd up to the Tremadoc;— Dr. Hicks writes:—“The Longmynd series, so well exposed in coast-sections at St. David's, is evidently identical with that of North Wales and Shropshire, the lithological characters and the order of succession being strangely alike. In Shropshire, North Wales, and Ireland they have yielded a few indications of life, but these districts need further exploration ”*. How true was this last remark will be seen in the sequel. On the 5th August last I received a letter and box of specimens from Professor James J. Dobbie, of the University College of North Wales, Bangor

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