170 
also stated to have been found in them. The fossils of the grey- 
wacke are said to be not very numerous; but the Trinucleus ap- 
pears to be abundant on the line of road between Prague and Pilsen ; 
and in a gorge near Lodentz, about fourteen miles from Prague, is 
a quarry which yields shells and other organic remains; and on the 
opposite side of the road, near the same spot, similar fossils may be 
obtained. ‘Trilobites occur at Ginetz, and Orthocera at Karlstein ; 
and both these localities and the neighbourhood of Prague are men- 
tioned as rich in organic remains. The Trinucleus Caractaci is 
stated to occur near Zebrak.* 
A letter was afterwards read, addressed to Dr.Buckland, P.G.S. 
by the Rev. John Gunn, and dated Dec. 21st, 1839. 
This letter was accompanied by three paramoudras from the chalk 
near Norwich; and they had been selected by Mr. Gunn on account 
of one of them presenting a tuberculated exterior, a character which 
he states a paramoudra commonly assumes when it is in contact 
with horizontal lines of nodular flints; and the other two had been 
chosen because Belemnites and shells are imbedded in their sub- 
stance. The letter contains some observations on the irregularities in 
the surface of the Norfolk chalk, and on the pipes or sand galls by 
which it is penetrated. With reference to these tubular hollows, 
Mr. Gunn refers to Mr. Lyell’s description of them, read at the 
meeting of the British Association at Birmingham, but he calls at- 
tention to their being constantly filled in the district examined by 
himself, with sand, gravel, or crag, to the total exclusion of all ma- 
terials belonging to the strata between the chalk and the crag; and 
he therefore infers, that the sand galls were not eroded during the 
eocene period, but that during that long period the Norfolk chalk 
was denudated. 
The letter was also accompanied by some specimens from the 
boulders contained in the diluvial (drift) strata of Norfolk and Suf- 
folk. Mr. Gunn is of opinion that these masses of rock indicate 
what were the strata that formed the shore against which the (so- 
called) diluviai waves washed; and that the masses were borne out 
to sea in a similar manner to the portions of cliff now annually de- 
stroyed by the waves. If the bottom of the present sea were raised, 
he says it would present features analogous to those of the crag and 
diluvial formations of Norfolk and Suffolk. 
* See the fossils of Caradoc sandstone, Silur. Syst. pl. 23, f. 1. 
