78 Canadian Record of Science. 
the Ordovician or Second Fauna, and in Hurope they first 
appear about the horizon of the Ceratopyge shales. 
Other trilobites help to estabiish this connection, as the 
Chinese Conocephalites,? and Dames himself compares the 
Chinese Agnostus with A. cyclopyge of the upper part of the 
Olenus Zone in Hurope, and with species of Lower and 
Upper Potsdam age in America. 
These observations on the trilobites serve to show that 
the fauna, of which they form a part, is younger than the 
Acadian series, or at least younger than Stages 1 and 2 of 
that series. If, on the other hand, we were to regard the 
Georgian Series as the older, we would be met by greater 
anomalies in the vertical distribution of the genera than if 
we adopt Dames’ suggestion as to the age of the correspond- 
ing series in China, and place it with the Scandinavian 
Ceratopyge limestone. 
Similar arguments as to the more recent age of the Geor- 
gian fauna might be drawn from the brachiopods ; among 
which Orthisina may be referred to. This genus is un- 
known in the Acadian Series, and in Kurope we do not 
know of it in the Cambrian at all; but it is a well-known 
genus of the Ordovician system. Hence the presence of 
three species of this genus in the Georgian fauna gives it, 
as a Cambrian fauna, a decidedly modern facies. 
The paleontological relations of the Georgian fauna may 
be summed up in the table on the following page, from 
which it will appear that they are decidedly with the 
faunas of the upper rather than the lower part of the Cam- 
brian System :— 
> Compare Conocephalites typus, Dames, with C. teucer, Billings ; 
also Anomocare latilimbatum, Dames, with Ptychoparia Pichoensis, 
Walcott; also, A. planum, Dames, with Conocephalites Adamsi, 
Billings. 
