AT 
The latest accounts of fossil footprints we have had 
occasion to notice are those of the Crustacea, already 
mentioned, as found in Canada, and of the Chelonian 
in Scotland. The Canadian impressions, called by 
Professor Owen Protichnites, were discovered in the 
year 1847, and were laid before the London Geological 
Society in 1851. The most remarkable circumstance 
about them was their existence, as already stated, in 
a white sandstone, near the banks of the River St. 
Lawrence, at Beauharnais. This sandstone, which has 
been described by New York geologists under the 
name of Potsdam, is thought to belong to the Silurian 
system, and to have a higher antiquity than even the 
“ old red.” 
The Scotch footsteps are situated in the old red 
sandstone, and are those of a Chelonian. So that we 
have now two series of tracks, the Crustacea in Canada 
and the Chelonian in Scotland, of higher antiquity 
than any which had been previously discovered. 
On a review of the labors of President Hitchcock, 
we are struck with admiration at the immense details 
that, in the midst of arduous official and literary 
duties, he has been able to go through with in the 
