166 
THE GEOLOGIST. 
of a limestone, wliich, from comparison, is supposed to have been 
brought from the counties of Tyrone and Fermanagh, by a current 
that denuded all the western aspects of the Greywacke ranges of 
hills, producing very markedly the phenomena of " crag and tail," 
which are there to be seen in endless examples. 
On the summits of many of the drift-hills are found some enor- 
mous blocks of mountain limestone, evidently deposited from floating 
icebergs, which ran aground in the shallow waters as these hills 
emerged from the deep, and there deposited their gigantic burdens 
as the ice melted away. 
The accompaning sketch (PI. XI.), made by George Morant, Esq., 
Shirly House, gives the true relative position of the fossil. The ver- 
tebra was found embedded in gypsum, about 1 foot below the surface 
of the gypsum rock. The section in the plate gives — alluvium 2 
feet ; peat 1 ; glacial drift 6 ; gypsum 1 foot ; then the vertebra in 
the rock, which extends downwards to a thickness of 40 feet. Thus 
we find an unquestionable vertebra of Megaceros Hibernicus em- 
bedded in solid gypsum, of an age much older than any glacial drift. 
The total absence of fossils in the ferruginous clay and gypsum, 
which are of contemporaneous origin, made it impossible to give any 
other than a stratigraphical age to the bed, in which the vertebra 
was found, it being placed beneath the oldest drift and lying on the 
lower coal-sandstone. The Irish Elk is therefore of much greater 
geological antiquity than what has been hitherto supposed. 
Tunhridge, April 2, 1864. 
NEW SPECIES OF TEEEBRATELLA, EEOM THE 
BARGATE STONE. 
Bt Me. C. J. A. Metek. 
I send some drawings and a short description of a pretty little 
Brachiopod from the Lower Greensand of Godalming, of which, un- 
fortunately, I possess at present only a few single valves, viz. 7 dorsal 
and 4 ventral valves. These are, however, sufficiently perfect to en- 
able me partially to describe the shell, and I take the present oppor- 
tunity of so doing, with the hope that, at some future time, better 
specimens may come to light. (See PI. XII. Figs. 1-6.) 
The species is apparently new, local in distribution, and, so far as 
I am at present aware, confined to the " Bargate stone " of Guildford 
and Godalming, the position of which is near the base of the ferru- 
ginous or upper division (of Fitton) of the Lower Greensand. From 
the partial outward resemblance of this shell to that of Terehratella 
Menardi, and from the fact of the hinge line and medial septum in 
the dorsal valve being of the same form in both, I am inclined to con- 
