14 Scientific Proceedings, Royal Dublin Society. 



Block r (M 6, 7, 8, 9). ' 310 feet = Z. (M 7 is a repetition of M 6.) 



Abundant — • 



Syringopora 6, Van. (on Euoinphalus). (M 6, 7.) 

 Productus hurlingtonensis, Hall. (M 6, 7, 8, 9.) 

 Schehoieiwlla crenistria, Mut. Z. Van. (M (5, 7.) 

 Syringothyris carteri,'S.sl\. (M8.) 

 Athyris glabristria, Phill. (M 8, 9.) 

 Camarotoeehia mitcheldeanensis, Van. (M 9.) 



„ aff. mitcheldeanensis, Vau. (M 7.) 



Less common — 



Am2}lexus coralloides, Sow, 



Zaphreniis omcdiusi, Ed. & H., Carruthers. 



„ densa, Carruthers. 



„ dekmouei, Ed. & H., Carruthers. . 



Vaughania cleistojMroides, Garwood. 

 Productus {Avonia), of. youngiamis, Dav. 



„ „ sp. (? aff. bassus, Vau.). 



&yringothyris laminosa, M'Coy. 

 Spiriferina aff. octoplicata, Sow. ? 

 Reticidaria aff. lineata, Mart. 

 Orbiculoidea sp. 



It seems best simply to correlate these beds with Z, without attempting 

 to divide them. Zaphreniis densa is common at the base, which might 

 suggest that we have only got Z^. This, however, would be an unsafe infer- 

 ence in view of the fact that tliere are some unexpected phenomena at 

 Malahide ; for example, Spirifer clathratus is only abundant well up in C, 

 and Seminula occurs below C. 



Syringothyris carteri, Hall, which is extremely abundant in M 8, agrees 

 in every way with Schuchert's description of the American shell,^ even as 

 regards the mode of preservation, which, he says, is usual, i.e. crushed in 

 shale. The characteristic " twilled " ornament of Syringothyris is well seen 

 in the Malahide material. This shell is reported from /3 of Burrington^ and 

 from /3 and Z of Belgium.' 



' Ninth Ann. Rep. State Geologist. New York, p. 30. 



2 Reynolds and Vaughan, Q. J. G. S., vol. Ixvii, 1911 (" Burringfcon Paper "), p. 364 

 (S. typa, Wiuohell). 



3 Vaughan, Q. J. G. S., vol. Ixxi, 1915 (" Belgian Paper "), pp. 8-10. 



