4 Early Trilobites of the Cambrian (Rocks — Matthew. 
TRILOBITA 
13 
r 
\ 
,»^ 
o 
at« 
W 
u> 
P" r" " 
2 S ■ 
,j a • 
pi" 
@ Ptychoparidye 
p " 
,— ^fc-JL-^^^ 
A • 
Paradoxides 
K 
O JO 
2 '^ 
