548 Scientific Proceedings, Royal Dublin Society. 



"(e) . . . Productus oL fimbriatus . . , irom the top oi the megastoma heds, 

 occurs commonly in P." 



Some of these points may now be discarded : — 



(«) The Lane Limestone has been shown to be of C, age. 



(d) Jllichelinki mecjastoma has its maximum in C S. (see Quart. Journ. Geol. 

 Soc, vol. Ixvii, 1911, p. 371). 



(p) Productm cf. fiinbrUdus (here called P. aculeato-fimbriatus) occurs 

 also in the Holmpatrick Limestone (C S) and the Curkeen Hill 

 Quarry (D), so that it has probably a very long range. 



{b) is based on a loose specimen. 



(c) remains for what it is worth. 



Vaughan next adds two points against the correlation with D suggested 

 ill the arguments just enumerated. 

 " («) The dominant coral of the megastoma-heds and of the Carlyan 

 Limestone — Lithostroliori cyatho2)hijlloides — is markedly more 

 Cyathophylloid than Lithostrotion cf. affine of the D P phase, 

 and approaches nearest to a form rare in C Si of the South- 

 western Province and of Eavenstonedale. 

 " (6) The Lithostrotion-like Clisiophyllids of the megastoma-heds and of the 

 Oarlyan Limestone agree more closely with Sj forms from the 

 South-Western Province, the Ingleborough area, and Arnside 

 than with any D form yet known." 



There follows a " faunal comparison of the Eush and Lane Conglomerates " 

 as follows : — 

 " Eesemblances : — 



" (1) An identical Zaphrentis-iaoies precedes each. 

 " (2) Michelinia succeeds Zajjhreniis as a commoa fossil. 

 " Differences : — 

 "(1) The Eush Conglomerate is fossiliferous ; the Lane Conglomerate 



barren. 

 " (2) Michelinia megastoma is common in the Eush, but rare above the Lane 

 Conglomerate. In the case of Michelinia cf. tenuise^jta the reverse 

 is true. 

 "(3) Campophyllimi aff. Murchisoni and Biphyphyllum siibibicinum abound, 



above the Lane, and are absent from the Eush Conglomerate. 

 " (4) Lithostrotion cyathophylloides abounds in the Eush ; no Lifhostrotion is 

 met with above or below the Lane Conglomerate. 



