Brachiopoda.
1. Strophomena corrugatella, Dav. Keisley.
2. rhomboidulis, Wilckens. Keisley.
3. deltoidea, Conrad. Keisley.
4. expansa, Sow. Keisley.
5. Orthis biforata, Scbloth. Keisley.
6. calligramma, Dalm. Keisley.
7. flabellulum, Sow. Keisley.
8. Actoniæ, Sow. Keisley.
9. vespertilio, Sow. Keisley.
10. porcata, M'Coy. Keisley.
11. elegantula, Dalm. Skelgill Beck.
12. Discina? corrugata?, M'Coy. Keisley.
13. Triplesia? monilifera, M'Coy. Keisley.
14. Atrypa imbricata, Sow. Keisley.
15. Leptæna tenuicincta, M'Coy. Keisley.
Cephalopoda.
1. Orthoceras vagans, Salt. Keisley. Abundant.
Crustacea.
1. Sphærexochus mirus, Beyrich. Keisley.
2. Cheirurus juvenis, Salt. Keisley.
3. bimucronatus, Murch. Keisley.
4. gelasinosus, Portl. Keisley.
5. cancrurus, Salt. Keisley.
6. octolobatus, M'Coy. Keisley.
7. Lichas laxatus, M'Coy. Keisley.
8. hibernicus, Portl. Millom.
9. Illænus Davisii, Salt. Keisley.
10. Bowmanni, Salt. Keisley.
11. Rosenbergi, Eichwald. Appletreeworth Beck.
12. Calymene Blumenbachii, Brongn. Keisley. Rare.
13. Agnostus, sp. A form somewhat resembling A. trinodus, Salt. (= Trinodus agnostiformis, M'Coy), in shape and size, but having its whole surface tuberculated. Not uncommon at Keisley.
14. Phacops (Chasmops) macrourus, Sjögren. This characteristic Bala species is the Odontochile obtusicaudata of M'Coy; but it wants the surface-granules of the true P. obtusicaudatus, Salt. Fine tails, though somewhat distorted by cleavage, are not uncommon at Appletreeworth Beck.
15. Phacops apiculatus, Salt. Appletreeworth Beck.
16. Ampyx Sarsii, Portl. Keisley.
17. Remopleurides, sp. Alai-ge form allied to, but apparently distinct from, R. longicapitatus, Portl. Not uncommon at Keisley.
18. Proëtus, sp. The free cheeks only are known, and resemble P. latifrons, M'Coy. Keisley.
19. Bronteus, sp. Pygidia only known. Keisley.
20. Beyrichia impendens, Jones. Appletreeworth Beck.
21. Primitia protenta, Jones. Appletreeworth Beck.
No one can analyze the preceding list of fossils and entertain any doubt as to the geological horizon of the Coniston Limestone. Whether or not it be in the precise position of the Bala Limestone of Wales is a point which may admit of doubt; but it is the precise equivalent of the limestone of the Lower Silurian of Portraine, co. Dublin, and also of that of the Chair of Kildare (see Appendix),
