240 Correspondence—IIr. 8S. V. Wood. 
NorFotK AnD Norwico Narvurarists’ Soctrry. —On Tuesday, 
Jan. 30th, a paper was communicated by Mr. C. Reid, of Her Majesty’s 
Geological Survey, on a species of Lithoglyphus from the Weybourn 
Crag. Among the mollusca recently found in the Weybourn Crag, 
near Cromer, Mr. Reid discovered several specimens of a shell, 
which, when compared with Lithoglyphus jfuscus in the British 
Museum, was found to correspond exactly with it. Mr. Reid said 
that the two Danubian species, L. fuscus and L. naticoides, were 
closely allied, but though one was figured in Woodward’s Mollusca, 
they were neither of them included in any monograph on British 
shells. He considered the discovery of this freshwater shell associated 
with Corbicula fluminalis in England to be of specia Jinterest. atho- 
glyphus fuscus is only found living in Europe in the present day in 
the river Danube; it is also said to be found in South America.-~ 
Eastern Daily Press, Feb. 5, 1888. , 
CORRES PoON DmINC zr. 
—_——<>——_ 
REPLY TO MR. MELLARD READE. 
Srr,—The point near Aylmerton which Mr. T. M. Reade writes 
you (apropos of my objection to his view of the source of the 
masses transported into the Contorted Drift of North-east Norfolk), 
is the highest to which the Ordnance Survey has levelled in Norfolk, 
is near the Cromer Coast, and about two miles and a half from 
Cromer Lighthouse hill, mentioned by me as not much exceeded in 
elevation by any point in Norfolk. The whole (or very nearly so) 
of this 831 feet is, ike Cromer Lighthouse hill, made up of the bed 
of the sea into which the ice in grounding thrust the masses of re- 
constructed, 7.e. morainic, chalk which appear in the cliff section, 
and are worked in numerous pits inland (at Aylmerton among the 
rest) ; and the position of these masses show that their grounding 
took place up to the point when all, save the very uppermost part, 
of this sea-bed had accumulated. 
The English Encyclopaedia notwithstanding, West Norfolk is all 
below, and most of it much below this. How, therefore, could cliffs 
there, as Mr. Reade supposes, have furnished these masses to the 
transporting ice ? 
Great banks of the material of which these masses are composed, 
formed by extrusion from the land-ice where it at this time termi- 
nated at the sea, occur near (and in one place flush with and up to 
the top of) the west side of the Chalk Wold, in Central Lincolnshire ; 
and it is there, and there only, that the conditions are to be found 
which answer to the source of these masses. 
Srarues V. Woop. 
March 22nd, 1883. 
