313 
THE CAMBRIAN TRILOBITES OF AUSTRALIA AND 
TASMANIA. 
By R. ErHERIDGE, Jun., Director and Curator cf the 
Australian Museum, Sydney. 
[Read October 9, 1919.] 
Pirates XXXIX. AND XL. 
, 
I. INTRODUCTION. 
resent communication is an attempt to condense 
sounder elaboration by those who may come after and, with 
access to more complete and extensive material, engage in this 
interesting study. 
reat drawback to a satisfactory elucidation of our 
accumulated to justify the use of the term Cambrian simply 
for a vast thickness of beds, in all probability synchronal 
a sequence based ocal facts and conditions. Two opera- 
tions will accelerate this, detailed field work and energetic 
collecting. 
: With the view of recording the opinions of others, I have 
in each instance quoted the horizon assigned to a given species. 
II. HisroRx. 
1877.—So far as my researches have progressed, the first 
geologist to discover Trilobite remains in Australia, afterwards 
