SS ee 
Geology and Mineralogy. 267 
Dawson in the Coal measures of Nova Scotia. To the abov 
genera I have now to add those of Hydrobia, Stoastoma ?, 
Lithoglyphus, and rhage ati from the of the n 
England, some of which I have little doubt are older than the 
is 
eh 
= 
=} 
te) 
7] 
presence of nine genera of land and freshwater shells in the lead- 
veins of this countr 
In addition to the list of pot yt remains which follows, num- 
bering about 112 species from the north of England and North- 
Wales mines, eight, which are not in a» omens have been obtained 
from Wes eston, a and to these again are to be added 89 in the list 
previously given from Charterhouse, so that in true and workable 
mineral veins I have found 209 species. In the ee 
Limestone of the Frome ae precisely simil 
orke 
though the fissures are no d. These Rhetic and Didi 
veins have yielded me seb 70 species, so that, including the 
districts I have enumerated, I have obtain m vein-fissures, 
with their deposits of different ages, about 279 species of organic 
remains. 
heii these peculiar circumstances, I have ae the oldest 
wn Mammalia, the oldest land and freshwater Molluse a, about 
a2 species of fish, and about 8 of Reptilia, besides the eal: groups 
o which reference has been made 
P tie regard to the origin of the veins, Mr. Moore observes as 
) 
The chief foi a of ae ape mineral veins I find to be of marine 
he are 
ty. e 
they contain land shells, as on the Mendips, or freshwater shells, 
which occur in the veins of Alston, and are wide-spread elsewhere, 
when within the influence of the ocean, and before their present 
i len since which time, as I have before stated, I doubt if 
there la e re Any eerie alteration in their contents. 
