AMONG SIMPLE BARCODE ORGANISMS. 



299 



It occurs chiefly in dark ponds shaded by trees and contain- 

 ing decaying leaves. Its soft sarcode body is included in a 

 siliceous capsule of a spherical form regularly perforated in the 

 manner of latticework, and supported on a long siliceous pe- 

 duncle. 



Pseudopodia are projected through the latticework of the cap- 

 sule ; and these, as in the Actinophryidae, are composed of an 

 axis-substance, and a cortical substance. The axis has been fol- 

 lowed into the interior of the protoplasm. Vacuoles which hold 

 no stable position are scattered through the protoplasm ; and 

 there is a vesicle-like nucleus, which is rendered evident by the 

 application of acetic acid. 



Cienkowski had already shown the occurrence in Clathrulina 



Fig. 17. 



Clathrulina elegans. A. The completely developed rhizopod (after GreefF) 

 B. A swarm-spore of Clathrulina elegans (after Hertwig and Lssser) : n, nu- 

 cleus ; c, contractile vacuoles. 



