478 Canadian Record of Science. 
they are the most varied, and were more sensitive to the 
changing conditions of environment than the others. 
In Brégger’s admirable work on the Stages 2 and 3 of the 
Paleozoic rocks of Norway, a table is given which shows 
the succession and range of the species in the Cambrian 
faunas of that country. Then as regards the neighboring 
kingdom of Sweden, Dr. G. Lindstrém’s list (1888) of the 
fossil faunas of the Cambrian and Lower Silurian rocks is 
complete for the several zones of the Cambrian in that 
country. Combining the genera from these sources a full 
representation of Cambrian life in Scandinavia is obtained, 
so far as relates to the genera of the trilobites. 
The first or oldest fauna presents the following genera: 
OLENELLUS (by its sub-genus * Arionellus (=Agraulos.) 
Musonacist) 
* Ellipsocephalus. * Agnostus. 
Of these genera one is peculiar and three (marked by an 
asterisk) pass to the next fauna. 
In the second fauna are the genera. 
* Harpides. Solenopleura. 
ParaDoxipgs (including Centro- Arionellus. 
pleura.) Anomocare. 
Ellipsocephalus. Dolichometopus. 
*Tiostracus (includes Ptychco- Aneucanthus (c.f. Centropleura ?) 
paria.) Corynexochus. 
Conocoryphe. Microdiscus. 
Elyx (=Ctenocephalus.) * Agnostus. 
Here are fourteen genera of which three are found at 
higher horizonsin the Cambrian system. Under Liostracus 
the Swedish paleontologists include Ptychoparia which 
with Agnostus has a wide range in the Cambrian system, so 
that with the exception of these genera the break is almost 
complete, between this fauna and that which follows. 
Conocoryphe as understood in Sweden does not extend be- 
yond this fauna. 
+The name of the leading genus (or genera) of each fauna is 
given in Roman capitals. 
