KtirJii I'rotoxoa. — Mullh(^ir. 149 
8. In ciystalliiie schists near Pornic. 
Tims while they are in relation to the sedimentary rocks in 
the north of Brittany, the}' are subordinate to the crystalline 
schists in the south. "We understand the importance of 
these observations to those geologists who see in the crj^stal- 
line schists the sedimentary rocks metamorphosed." 
"As the term pre-("ambrian is applied as a definition to the 
mass of all the stratified sediments, anterior to tlie ('ambrian, 
in a condition to contain organic remains, it is by preference 
to the pre-Cambrian period that I [L. Cayeux] refer them." 
It will be seen tiiat Mr. Cayeux's use of the term pre-Cam- 
brian is relative and it is made equivalent to Muronian of the 
geologists of the Canadian survey, and Algonkian of those of 
the United States survey. " 
Desfriplioii of the Forioiiiniffrd. 
In his later paper, June, 1894, published in the transactions 
of the Geological Society of France,* Mr. Ca3'eux describes 
the Foraminifera of this fauna. These Foraminifera were sim- 
ple or compound. He passes by the simple ones as capable of 
being confounded with certain radiolarians, the pores of 
which have been obliterated. The conii)ouiul forms had 
chambers var3Mng in number from two to seven. These 
chambers were either spherical or oval, and those of two or 
three chambers had a few sliort processes (rudiments of 
spines) ; the cells were not arranged in a single series, but so 
disposed that each might l)e tangential to two others, Mr. 
Cayeux observed that some individuals had tiieir tests pierced 
with minute pores, which would refer them to the Foraminifera 
Per/V>;v/^(^/ of Carpenter. "Like the pre-Cambrian radiolari- 
ans these have dimensions which separate them from tlie 
known paheozoic Foraminifera. The largest chambers scarcely 
attain a diameter of 10 ^z."' 
"Wiiether isolated or agglomerated chaml)ers be present it 
is possible to distinguish the fragments of Foraminifera from 
those of the radiohu-ians that accompany them, for with the 
latter there are vestiges of [)ores of hirge size. The mode of 
junction of the chambers with the niultilocular forms is also 
a distinguishing feature." 
The Foraminifera fig ured by Mr. Cayeux recall very forcibly 
• "Comptf n-iiilu (le la Socit'le ,!;('oli)i,n(iiic dt- friinc*'. ji. 7!>. 
