348 
THE GEOLOGIST. 
it and our British strata. Except M. Barrande, indeed, the prince of 
paleontologists, no one has entered more heartily into Bohemian 
geology, especially of its older rocks, than my friend. We visited all 
the principal silurian localities together; Dr. Fritsch commenting as he 
went, till we came to the venerable " Stiper Stones" and the overlying 
Tremadoc rocks of Shelve in Shropshire. Even these last, though 
they have not yet distinguished them by a separate name in Bohemia, 
he recognised as identical with the lowest bands of their second 
fauna D, and in the main I believe he is quite right. 
The Lingula flags we were unable to visit, but Church Stretton 
was within reach ; and when, on the very last half- day we had to 
spare, we walked up the Carding Mill brook smd found the Aimelides 
in place, he could scarcely believe his eyes. 
There they were, however, — the certain records of a sandy shore 
gone by. And we obtained enough to convince him that it was 
worth while to search his own " azoic" rocks. He has lately been 
appointed to a new office in the Museum, but has used the little leisure 
accorded him to search carefully for these old traces. In a letter 
received to-day (July 8th) he tells me " In our Cambrian stratum B 
I have at length found marks of annelides ! and I beg you to write 
me in what book you have published the Arenicolites sparsiis from 
Church Stretton." 
Dr. Fritsch' s Sketch of Bohemian Arenicohte. 
All doubt is set at rest by the slight sketch he has sent. There 
are the double holes characteristic of these old worm burrows. The 
tubular hollows leading to them are seen on the sides of the slab, and 
are identical ^vith those of the Scolithus or Arenicolites figured in 
Hall's American Paleontology, or in the last edition of " Sduria." 
So certain is it, that steady research will be rewarded in the most 
barren formations. iSTow the same diligence must be given by our 
Canadian cousins to the Huronian rocks of Lake Superior. In fact, 
we must leave off calling rocks azoic. They only want hunting, in 
proportion as they are old. 
I believe most fully that these coincidences in organic remains 
over wide areas are not accidental. The fauna of the " zone primor- 
diale" or Lingula flags, has tui'ned up the same great group of trilo- 
bites wherever it has been searched ; and this, which is an older 
formation still (perhaps much older), has shown, wherever it has 
