Trilobites from the Paradoxides Beds of Comley Shropshire

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Abstract
Introductory remarks In a previous communication I called attention to certain trilobites associated with Callavia. callavei Lapw., from the limestones at the top of the Lower Comley Sandstone, and indicated the correspondence of many of the forms with those of Dr. Matthew's Protolenus Fauna from the Cambrian of the Atlantic province of North America. The object of the present paper is to describe and figure the trilobites of the Upper Comley Sandstone, and to endeavour to estimate the faunal importance of the physical break between the upper and the lower groups of strata. Many of the specimens have been obtained during the progress of the excavations that I have been conducting for the British Association; others have been collected at various times during the past twenty years; and, through tho kindness of Prof. Charles Lapworth, I have had access to the type-specimens of his Paradoxicles groomii, which are now figured for the first time. The fossils described in this paper occur at three distinct horizons. A lower one, the Quarry-Ridge Grits, at the base of the Paradoxides-bearing beds of the Comley Sandstone, where they rest unconformably upon the Protolenus and Callavia Beds; a second, the Hill-House Beds, some 300 feet higher in the succession; and a third, the Shoot-Rough-Road Beds, near the top of the Comley Sandstone Group, presumably several hundreds of feet higher. The stratigraphical relations of these beds to one another and to the strata above and below them, the local names adopted, and the horizons from which

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