Vol. 68.] PALEOZOIC EOCKS Or THE KILBRIDE PEXI:N^ST7LA. 99 



An interval of erosion, perhaps corresponding to the Lower Old- 

 lled-Sandstone Period, followed, and then came the conglomerates 

 of Upper Old-Eed-Sandstone or Lower Carboniferous age, which 

 are to be seen towards the eastern end of the peninsula at the lake 

 side,^ and of which a small remnant containing a block of coarse 

 porphyrite is seen resting on the lime-bostonite west of Fox Hill." 

 If the dolerite intrusions, as seems probable, are of the same period 

 as those of Tourmakeady, we may regard them as of post-Old-Red- 

 Sandstone age. They are clearly later than the cross-faulting 

 which shifted the outcrop of the Silurian rocks. 



In conclusion, our sincerest thanks are tendered to Mr. F. R, 

 Cowper Reed, M.A., for naming the great majority of our fossils ; to 

 Miss G. L, EUes, D.Sc, for examining the graptolites ; to Dr. J. 

 S. Flett, M.A., for much help in the examination of the igneous rocks ; 

 to Mr. Herbert H. Thomas, M.A., for the loan of rock-sections ; and 

 to Prof. G. A. J. Cole for 6-inch Ordnance Survey maps. 



Appendix. 



jS'ote on a neiv Species of Caryocabis {C. kilbridexsis) from the 

 Arenig Rocks of the Kilbride Penixsitla. By Henry 

 Woodward, LL.D., F.R.S., V.P.Z.S., F.G.S. 



Early in the present year I received from my friend Prof. S. 

 H. Reynolds a very interesting little phyllopod crustacean obtained 

 inthe Arenig rocks of Kilbride (Mayo), with a request to subjoin a 

 note upon it to the paper which Mr. Gardiner and he were reading 

 to the Geological Society. 



This form approaches the Carijocaris wrightii of Salter, a species 

 which also occurs in shales of Arenig age on the Firth of Clyde and 

 at many localities near Keswick (Cumberland), etc.^ ; but the cara- 

 pace in C. lurightii is narrower in proportion and less arcuate on 

 its ventral margin, while the posterior border is truncated and not 

 produced into a latero-posterior spine as in the Kilbride example. 



The Irish phyllocarid has both the impression and counterpart of 

 the carapace preserved (both being marked by the authors as 55) 

 and exposed on the surface of a rather coarse dark-brown shale, 

 exhibiting a good side-view of the carapace and three caudal 

 segments displaced and bent upwards dorsally. 



The carapace is 25 millimetres in length, 5 mm. in depth at its 

 anterior end, and increases to 10 ram. in depth near the posterior 

 ventral border. The anterior margin is truncated, and its border 

 is fringed by ten or twelve minute spines about 1 millimetre long 

 directed forwards (resembling in appearance the oral cirri in 



^ These large masses of conglomerate are not demonstrably in place ; but it is 

 impossible to doubt that they are almost in position. 



- This patch is too small to show in the map (PI. YI). 



3 See T. K. Jones & H. Woodward, Monogr. Pal. Soc. pt. ii (1892) p. 89 

 & pi. xiv, cf. fig. 15 &c. 



