542 Scientific Proceedings, Royal Dublin Society. 



(8) The Zaphrentes of the Lane Limestone are identical with those of the 

 Rush Slates, and agree better with the (?) D forms of the Oohie 

 area than with the Touruasian Zaphrentes of the South- Western 

 Province. Z. Omalitm var. ambigua ... is, as yet, not certainly 

 known below Dj. 



In view of subsequent work, including the above faunal list, we may 

 remark on these points as follows : — 



(1) Planicostate Spirifors have not been found in the course of the 



present work. 



(2) Several specimens of this shell, also poor, but in situ, have been found 



in the Lane beds. It is evidently P. suh-lmvis. 



(3) This is not a typical F. longispinus, but, as recorded in Vaughan's 



faunal list, P. concinno- longispinus. 



(4) Several fragmentary pedicle valves of a small glabrous Spiriferid 



without dental plates were found. It would be unsafe to base 

 any conclusion upon them. 



(5) The Michelinia was only obtained in fragments embedded in matrix. 



It is now suggested that it may be M. grandis. 



(6) and (7) These points could only be regarded as corroborative evidence, 



and have little weight considered alone. 

 (8) The Eush Slates are undoubtedly of Z-0 age (vide infra). Z. ambigua 

 is common in the lowest exposure of the Pi.ush Slates, below a 

 typical 7 fauna. 



HoLMPATRicK LiMESTONE = S = Parts OF THE Cho'iietes caHnata Sub-Zone 

 AND " Gastropod Beds " of the North-Westekn Province. 



Correlation with the North- Western Province is based upon the following 

 association : — Diphyphyllum suhibicinum, varieties of Zaphrentis Enniskilleni, 

 Litliostrotion Martini, Koninckophijllutn ashfellen&e, large Schelbcienella cf. 

 crenistria and Productus corrugato-liemisphencus. All the names, too, marked 

 with an asterisk in the above faunal list occur in Garwood's lists for the 

 above-mentioned zones.' 



This correlation involves the equivalence of the Holmpatrick beds 

 to S of the South-Western Province. The following points support 

 this conclusion : — 



Litliostrotion Martini is first found in Si of the S. W. P. 



Cyathophyllum ^ is a S species. 



' Quart. Journ. Geol. Soc, vol. Ixviii, pp. 468 and 470. 



