286 PRIMORDIAL FAUNA AND POINT LEVI FOSSILS. 
Report, and I then received his authority for the addition of the note 
which was appended. 
This in a few words is a simple history of the matter relating to the 
publication of these species. I made no remarks or comparisons 
with the primordial fauna of Barrande in Bohemia, knowing that 
these features would be at once recognized by every paleontologist ; 
while their reference to the genus Olenus showed my appreciation of 
the nature of the fossils. 
I received a copy of the communication of M. Barrande, from Sir 
William Logan in September, a few days before setting out for my 
field duties in Wisconsin. Since my return to Albany, constant and 
pressing occupation has left me no time to consider a reply to a ques- 
tion of so much importance. 
Later discoveries in the limestones associated with the shales at 
Quebec leave no longer a doubt, if any could have been entertained 
before, that the shales of Georgia, Vermont, are in the same relative 
position ; and we must regard these three trilobites as belonging to the 
same fauna with the species enumerated by Sir William Logan as 
occurring in the Quebec group. Left to paleontological evidence 
alone, there could never have been a question of the relations of 
these trilobites, which would at once have been referred to the primor- 
dial types of Barrande. 
Sir William Logan yields to the palzeontological evidence, and says, 
“there must be a break.’ He gives up the evidence of structural 
sequence which he had before investigated and considered conclusive ; 
and having heretofore relied upon the opinion of the distinguished 
Geologist of Canada in regard to a region of country to which my 
own exa:ninations had not extended, I have nothing left me but to go 
back to the position sustained by paleontological evidence. Let us 
for a moment examine this paleontological evidence. 
The identifications of the fossils of the Quebec group, certainly 
show a remarkable agreement between the trilobites of this group and 
those of the Potsdam sandstone, in the occurrence of siz species of 
Dikellocephalus and one of Menocephalus; while the occurrence of 
many others is in agreement or not incompatible with the fauna of 
the Potsdam and Calciferous sandstones. The comparative values of 
the Trilobitic faunz of this group and of the primordial zone of 
Europe, as established by Barrande, is better shown in a tabular form 
which I here append. 
