president’s address. 
207 
middle Silurian of Largues, in France, and which has been 
described by Brongniart; and the second, of specimens of 
fossil scorpions in the Ludlow beds of Scotland, Gothland, 
and America. The latter differs from the former in many 
respects, and attains a length of about 12 J inches. Again, 
in a coal-pit in Bohemia, a scorpion of the little known order 
of Pedopalpi has been found, which presents a great similarity 
to present forms, and the same pit has yielded four new 
spiders, raising the number of Palaeozoic Arachnida to thirty- 
four. To an interesting paper by my friend, the Rev. P. B. 
Brodie, published in the “ Naturalist’s World,” I am indebted 
for this information. Of more recent geological events, viz., 
tiiose connected with the ice age, some important discoveries 
have been made in our county by Mr. Luff in the neighbourhood 
of Clun. His attention has been for many years attracted 
to the vast number of travelled blocks scattered about on the 
picturesque hills which surround that village, and he has 
with very great industry and care mapped down their 
position, and tracked them over hill and dale to the source 
from whence they came. He finds that they vary in size 
from small fragments to blocks of ten feet long;—that they 
can be traced over a tract some twenty-three miles in extent 
to the flanks of Plynlimmon, aud to Cai’rig Gwinnion, by the 
side of the Wye, two miles from Rhayader—the latter 
boulders consisting of a grit very marked in character;—that 
by far the largest blocks are found at the greatest distance 
from their source;—and that many of them lie at higher 
elevations than Carrig Gwynnion, pointing to the conclusion 
that they have been floated from that locality on icebergs. 
In concluding this part of my subject, I would refer to 
some statistics, kindly furnished me by Mr. Watts, as to the 
number of works bearing more or less on the geology of 
Shropshire, of which he is compiling a list. They amount, 
it seems, to no less than about 800, probably more than less. 
The record begins in 1712 and goes to 1885. The authors’ 
names include Aitkin, Murchison, Conybeare, Prestwicli, 
Lyell, Williamson, Ramsay, Davidson, Salter, Jones, Milne- 
Edwards, Owen, Liglitbody, Roberts, Randall, Morris, Maw, 
Woodward, Ricketts, Brodie, La Touche, Hall, Mackintosh, 
Eyton, Davies, Hicks, Hopkinson, Lapwortli, Crosskey, 
Allport, Callaway, Symonds, Salwey, Bonney, Houghton, 
Nicholson, Etheridge, Duncan, Vine, Flyglit, Harrison, and 
Reade. Such are among the more important contributors. 
The most active years, in each of which there are over a 
dozen references, are—1865 (17), 1869 (12), 1870 (14), 1871 
(15), 1878 (20), 1877 (12), 1879 (15), 1882 (14). 
(To be continued.) 
