282 ME. E. S. COBBOLD ON TRILOBITES [Aug. I9II, 



10. Teilobites from the Pabadoxides Beds of Comley (Shrop- 

 shire). By Edgar Sterling Cobbold, E.G.S. With Notes 

 on some of the Associated Brachiopoda, by Charles Alfred 



. Matley, D.Sc, F.G.S. (Read April 5th, 1911.) 



[Plates XXIII-XXVI.] 

 Introductory Remarks. 



In a previous communication 1 I called attention to certain trilobites 

 associated with Callavia 2 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 the kindness of Prof. Charles 

 Lapworth, I have had access to the type-specimens of his Para- 

 doxides 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 Para- 

 doxides-be&rmg 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 the principal fossils have been collected, are 

 shown in the vertical section published in my report to the British 

 Association Committee for the Excavation of Critical Sections in the 

 Palaeozoic Rocks of Wales & the West of England. 3 



1 Q. J. G. S. vol. lxvi (1910) pp. 19-51 & pis. iii-viii. 



2 See Smithsonian Misc. Coll. vol. liii, No. 1934 (Aug. 1910), where 

 Dr. Walcott adopts Dr. Matthew's term Callavia as a distinct generic name 

 for O. (Holmia) brbggeri, O. (Holmia) callavei, and other species (pp. 274 

 et seqq.). 



3 Eep. Brit. Assoc. 1910 (Sheffield) p. 121. 



