224 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. (Jan. 12, 
ing upon the restricted area of the district under review. In order 
to explain the lowering of the bed of the Avon by an increased 
-velocity of its stream, Strickland supposes a “ further elevation of 
the land,” to quote his words ; but it appears to me necessary to call 
in the agency of unequal elevation, the inland district of Warwick- 
shire having risen more rapidly than the portion nearer the sea, as 
Sir C. Lyell supposes to have been the case in reference to the denu- 
dation of the Loess of the Rhine, if we are to resort to a cause of 
which, as far as I am aware, no collateral evidence exists. 
Concluding g Remarks.—It would be interesting to know how far 
the evidence afforded by the marine mollusca found in the drift of 
the Severn valley may be able to explain the probable conditions 
under which the latter wasdeposited. The late Edward Forbes, in his 
valuable paper “ On the Geological Relations of the existing Fauna 
and Flora of the British Isles” remarks that, Littorine, Purpure, 
&e. are genera and species definitely indicating, not merely a shal- 
low water, but a coast-line. Regarding the evidence at present 
obtainable from the mammalian remains found in the beds contain- 
ing marine shells at Beckford, and in the neighbourhood of Wor- 
cester, and those from the freshwater gravels of the Avon and some 
of its tributaries, it appears that the number of species is much less 
in the former than in the latter. 
In thus venturing to bring the subject of this paper before the 
notice of the Society, I may perhaps be allowed to state that I have 
no pet theory to support, and no inclination to throw “small 
stones’’ at those of others, my chief object being to leave the subject 
in such a condition that future observers may be able to take up 
its further investigation at the point where I have left off. 
In conclusion, let me tender my best thanks to many kind friends 
for their zeal in forwarding the objects of the present inquiry. 
Discussron. 
Mr. Srartzes V. Woop, Jun., had long been aware of the existence 
of both the Chalky Boulder-Clay and the Middle Glacial Sand near 
Rugby. He pointed out the difference between the fauna of the 
sands of the Severn valley and that of the Middle Glacial sand of 
Hast Anglia, and thought it scarcely possible that the two sands 
could be identical. 
Mr. Gwyn Jurrreys was doubtful as to the authenticity of some 
of the shells which had been brought to Mr. Maw. The fossil shells 
from the Severn valley, TWellsonnema een. Manchester, and Moel - 
Tryfaen were nearly identical, and indicated raised beaches. He 
thought it possible that a definite line of such beaches might eyen- 
tually be recognized through that part of England. 
Mr. W. Borp Dawxins did not consider that Mr. Lloyd had shown 
any marked difference in the mammalian fauna of the Avon and 
Severn valleys. He had failed to discover any traces of Hlephas 
ntiquus in either. 
Mr. Prestrwrcn thought that Mr, Lloyd had probably divided the 
