24 Scientific Proceedings^ Royal Dublin Society. 



Summary of the Chief Points in the Paper. 



1. There are three faults of importance in the exposure, not only one, as 

 previously believed. 



2. The southern (Carrickhill) fault has the down-throw to the south, not 

 to the north. 



3. Correlation is made with Cj - Z of the S.W. Province of England. 



4. Three uew species are described and figured, namely: — Za-phrentis 

 jicnctoseptata, Michelinia gracilis, Undophyllum irregidare. 



5. Another form, which appears to be new, is described and figured, of 

 which sufficient material could not be obtained for a satisfactory study, 

 namely : — Lopliophyllum cf. costatum, McCoy. 



6. A Seminula (cf. ambigua) is reported in a Z3 fauna. 



PLATE I. COKALS FROM THE "C" ZoNE AT MaLAHIDB. 



Figs. 1 to 4. Zaphreniis junctoseptata, sp. nov. M 13 (p. 19). 



1, a, b, c. Photographs of three transverse sections from the same specimen. 



In Ic note the presence of two minors leaning against the counter 

 septum, although the majors have not yet all appeared, x 2'7. 



2. Camera lucida drawing of mature transverse section of a second specimen. 



X 5. 



3. Photograph of mature transverse section of a third specimen, x 2-7. 



4, a, b. Camera lucida drawings of two transverse sections of a fourth speci- 



men. X 5. 



Fig. 5, Michelinia gracilis, sp. nov. M 13 (p. 18). 



A weathered specimen, consisting of two corallites, on a slab of limestone. 

 Opposite the arrow a portion of the wrinkled epitheca is preserved. Just below 

 this, some of the tabulae are exposed, x 0*6. 



Fig. 6. Lophophyllwn cf. costatum, M'Coy. M 18 (p. 21). 

 Transverse section just below floor of calyx, x 2-7. 



Figs. 7 to 9. Endophyllum irregidare, sp. nov. M 2 (p, 20). 



7. Drawing of a specimen showing external characters, x 0'5. 



8. a, b, c. Three sections from another specimen, x 2-7. 



9. Portion of longitudinal section of a third specimen, x 2'7. 



Fig. 10. Caninia cylindrica, Scouler. M 13. 

 Transverse section of immature stage. This is from the specimen referred to 

 on page 17 as occurring at " near the middle" of M 13. It is figured because 

 this early stage seems to be rather rarely found, and it is larger than the 

 corresponding stage figured by Salee in " Le Genre Ganinia," Nouv. Mem. Soc. 

 beige GeoL, Mem. No. 8 (1910). x 2-7. 



PLATE II. 



The left-hand figure is a plan of the outcrop at high-water level. The 

 topography is reduced from the Ordnance Survey 25-inch map. 



The right-hand figure is a horizontal section along the line marked on the 

 plan. 



E, F, G, H. Blocks into which the section is divided by the three faults. 



M 1-M 13. Symbols for groups of beds, used in labelling the fossils. 



H (= M 18) is a higher horizon than Ml. 



G is a repetition of F. 



M4d. A bed taken as the top of the " ^«jj/irewto " zone. 



M 12, a and /3. Two beds of Schehi-ienella. 



M 12/8, in G, and the same bed in F, are marked by a chain-dot line. 



1 



