﻿CONCLUSION. 



113 



w e prefix a mark of interrogation to those species of which the 

 identification is not quite certain. 



Marwood and Pilton 

 Series of North Devon 

 and West Somerset. 



' Coomhola Series, 5 in 

 the County of Cork. 



Carboniferons Shales 

 and Slates. 



I. TewnrfttiiiA cnppnlns. 



X 



? 



X 





? 





? 



^ .8 Hpn c.splnpriji n n flpfprm i nnlilp 





X 





4. Athvns conccntrica 



X 



? 





•j. /vLiiyiii?, op., lou liiiptTicLL lu oc coriectiy ueicrminaoie . , 



x 



X 





f) Sni nffTfi VfM'iiPii \ lii vol rlisinnptn 



X 



X 





/ ■ — at 1*1 n t n 



/ • oil I<tl*l ••• ••••• 





X 



X 



8. — Urii 



X 





X 



J. Clloldia, 1(1/ . OCtUpilCrtla ...... 



X 



X 



X 



?10 Cvrtim lipfprnpliH ? ^pp PI YY fin- 1 CA 



.lu. V^Illlia UclHULUla 1 [M;c JTi. 114;. * *-*v .... 





? 





1 1. Hhynclionella pleurodon 



X 



X 



X 



12. — « pugnus ........ 



? 



X 



X 



13. — laticosta 



X 







ll, OClUpilU III c 11 a illlilMi^.i ........ 



X 





X 



1 t SJfrpntnrli vnrliiis rrpnistvn 



X 



X 



X 



1G. Orthis striatula vcl resupuiata 



X 



X 



X 



1 / . ' lUlcrilllcala ........ 



X 



? 





1 8. Chonetes Hardrensis ........ 



X 



X 



X 



19. Strophalosia productoides vel caperata ..... 



X 







20. Productas pralongus ........ 



X 







?2 1 . — longispinus ........ 



X 





X 



22. — scabriculus ........ 



X 



X 



X 



?23. — ? approaching to P. semireticulatus (see PI. XX, 









. .. . . fi S- 17 ) • . ■ • ; • • , • 





X 



? 



24. Discina nitida ......... 



X 





X 



25. Lingula squamiformis vel Mola (Salter) ..... 



X 





X 



In the determination of some of the Irish species from the ' Coomhola series' a certain 

 degree of uncertainty must still prevail ; for instance, it could not be made out whether 

 some crushed specimens should be referred to At/iyris conccntrica, or to A. lioiyssii, orwhether 

 certain impressions belonged to 0. interlineata, or to small examples of 0. Michelini. But 

 what appears quite evident is, that these dark shales and rusty-coloured grits from the 

 county of Cork contain an exceedingly small proportion of true Devonian types, and that 

 by far the greater number are with certainty Carboniferous. It is also quite true that 

 we observe in them casts of a shell exactly resembling those of Spirifera Verneuilii, or 

 V. disjunct a, found likewise in the Marwood and Pilton beds of North Devon ; but the 

 distinction between Sp. Verneuilii and Sp. striata is so small as to be sometimes with 

 difficulty determined from mere casts or impressions. The fossil which has, however, 

 puzzled me most from those so-termed Coomhola beds was a shell which in external 

 shape closely resembled Cyrtina Jteteroclita, a true Devonian type ; but I am also aware 

 that some exceptional examples of Spiriferina cristata, var. octoplicata, bear resemblance 



