184 Reports and Proceedings— Geol. Soc. London. 
an interruption. The author gave reasons for thinking that it came 
from the 8.E., and suggested that it may have descended from the 
Paleozoic ridge beneath London. The paper also included some notes 
on the Kimmeridge Clay and a peat deposit. 
3. ‘© A Review and Description of the various Species of British 
Upper-Silurian Fenestellide.”’ By G. W. Shrubsole, Esq., F.G.S. 
In this paper the author passed in review the forms of Fenestellidee 
which have been described from British Upper Silurian rocks. ‘These 
amount to nine in all—six described by Lonsdale, two by M‘Coy, and 
one by Portlock. From the imperfect condition of the specimens at 
the command of these authors, and especially from their characters 
being masked by an incrusting growth of corals, etc., and by subse- 
quent matting, it is in most cases impossible to identify them; only 
one of the nine species, namely F. rig¢dula, M‘Coy, being recognizable. 
The author discusses the peculiarities of these supposed species, of 
which he adopts only F. rigidula; and describes the other forms 
_ known to him under the following new names :—Fenestella reteporata, 
L’. lineata, and F. intermedia. ‘The author further discussed the rela- 
tions of the Silurian Fenestellide to those of the Carboniferous and 
to other organisms. 
_ IIT.—March 10, 1880.—Robert Etheridge, Esq., F.R.S., President, 
in the Chair.—The following communication was read :— 
‘On the Geological Relations of the Rocks of the South of Ireland 
to those of North Devon and other British and Continental Districts.’’ 
By Professor Edward Hull, M.A., LL.D., F.R.S., F.G.S., Director of 
the Geological Survey of Ireland. 
In this paper the author, after referring to his previous paper on 
the geological age of the Glengariff beds (Quart. Journ. Geol. Soc. 
vol. xxxv. p. 699), in which he showed that between them and the 
succeeding Old Red Sandstone in the south of Ireland there existed a 
very great hiatus, proceeded to compare the sections of the rocks of 
the south of Ireland with those of North Devon, and to show that the 
hiatus in question is represented in the latter locality by the whole 
of the Middle and Lower Devonian rocks. He then discussed the 
relations of the Devonshire rocks to those occurring north of the Severn, 
in Scotland, and in Belgium; and from this review of the whole 
question he arrived at the following conclusions :—First, that there is 
only one Old Red Sandstone properly so-called—represented in 
Devonshire by the Pickwell-Down Sandstone; in Ireland by the 
so-called Upper Old Red Sandstone, including the Kiltorcan beds; in 
Scotland by the so-called Upper Old Red Sandstone; and in Belgium 
by the ‘‘Psammites du Condroz.’’ Secondly that the so-called Old 
Red Sandstone of Herefordshire is the estuarine representative of the 
Middle and Lower Devonians of Devonshire; and that the so-called 
Lower Old Red Sandstone of Scotland, with its fish-remains, is the 
lacustrine representative of the Upper Silurian rocks. In conclusion, 
the author discussed the physical conditions under which these various 
formations were deposited. 
a 
