ii6 



RELICS OF PRIMEVAL LIFE 



mina and magnesia occupying a large place in the 

 mineralizing silicate. Fig. 24A gives two illustrations 

 of this — one a crinoidal stem from the Silurian of 

 New Brunswick, injected with a silicate of alumina, 



Fig. 24A. — [a) Joint of Crinoid injected with a Hydrous Silicate, 



Silurian, Pole Hill, Nexu Brunswick. ( x 25. ) 



{b) Spiral Shell injected with a Hydrous Silicate allied to Serpentine, 



near Liang wy I log, North Wales, (x 25.) 



iron, magnesia and potash ; the other a spiral shell 

 from more ancient perhaps Cambrian rocks in 

 Wales, filled with a silicate apparently more nearly 

 related to serpentine. Further examples will be re- 

 ferred to in an appended note. 



