34 



THE CHAIN OF LIFE. 



filled with glauconite and other hydrous silicates allied to 

 serpentine. 



Fig. 20. — a. Amoeba, a fresh-water naked Rhiatopod ; and b, Actino^htys. a. fresh-water 

 Protozoon of the group Radiolaria, with thread-like pseudopodia. 



(l\Vl^v 



Fig. 21. — Nonionina, a modern marine Foraminifer. Showing its chambered shell and 



netted pseudopodia. — After Carpenter. 



If we attempt to trace the Rhizopods onward from the Middle 

 Laurentian, we are met with a great hiatus in the Upper Lauren- 



