Vol. 52.] THE FAUNA OF THE KErSLEY LIMESTONE. 407 



20. The Fauna of the Keisley Limestone. — Part I. By F. H. 

 Cowper Reed, Esq., M.A., F.G.S. (Read February 26th, 1896.) 



[Plates XX. & XXL] 



During a recent rearrangement of the fossils from this limestone in 

 the Wood wardian Museum my interest was especially aroused by 

 the number of peculiar and unnamed specimens amongst them ; 

 and I was thus led to examine them with particular care, and sub- 

 sequently to visit Keisley myself and collect more in the field, as 

 well as to inspect Prof. Harkness's collection at Carlisle, and the 

 specimens in some small private collections. The following de- 

 scriptions have therefore been based on the examination of as large 

 an amount of material as was available. Prof. Harkness's collection 

 at Carlisle and that of Prof. Nicholson and Mr. Marr at Cambridge 

 are those upon which the well-known lists of Keisley Limestone 

 fossils have been founded ; the last list was published by Prof. 

 Nicholson and Mr. Marr in 1891. x 



By carefully removing the matrix I have been able to bring out 

 many minute characters previously invisible, and have also dis- 

 covered several entirely new species, which make an important 

 addition to our knowledge of the bed. 



My thanks are due to Mr. Marr, Prof. Nicholson, Mr. Goodchild, 

 Chancellor Ferguson, of Carlisle, Mr. E. T. Newton, and others for 

 help and information. 



In this first part of my communication the trilobites alone are 

 dealt with, being the largest and most characteristic section of the 

 fauna. In the second and concluding part the rest of the fossils 

 will be described, and the general relations of the fauna discussed. 



CRUSTACEA— Trilobita. 



A list of fossils from the Keisley Limestone was published in 

 I860 2 by Prof. Harkness. Amongst them he recorded the following 

 trilobites : — 



Cheirurus clavifrons, Dalra. Illcenus Davisi, Salt. 



bimucronatus, Murch. Lichas, sp. 



octolobatus ?, M'Coy. Harpes, sp. 



Am/pyx tumidus ?, Forbes. 



Again, in 1877, 3 Profs. Harkness and Nicholson gave the follow- 

 ing list : — 



Rpharexochus minis, Beyr. 



Cheirurus ju ven is, Salt. 



bimucronatus, Murch. 



gelasinosus, Portl. 



cancrurus, Salt. 



octolobatus, M'Coy. 



Lichas laxatus, M'Coy. 

 BlanuB Bowmani, Salt. 



Illcenus Davisi, Salt. 



Calymene Blumenbachi, Brougn. 



Agnostus, sp. 



Ampyx Sarsii, Portl. 



Bemopleurides, sp. 



Bronteus, sp. 



Proetus, sp. 



1 Quart. Journ. Geol. Soc. vol. xlvii. (1891) p. 507. 



2 Ibid. vol. xxi. (1865) p. 243. 



3 Ibid. vol. xxxiii. (1877) p. 468. 



Q. J. G. S. No. 207. 2 * 



