GYMNOMYXA. 5 



as opposed to myxopoil, a word indicating a form with the power of 

 emitting pseudopodia. 



Reproduction is commonly effected by simple division, but in 

 some cases encystment occurs, and the protoplasm breaks up into 

 a number of minute portions called spores. The spores may be 

 either naked or provided with a wall, forming the spore-case. 



FIG. 3. Rotalia veneta (after M. Schultze), with a Diatom taken in the network of 



pseudopodia. 



The marine shell-bearing forms contribute by the accumulation 

 of their shells to the formation of the sea sand, and even to the 

 deposition of thick strata. An innumerable quantity of fossil forms 

 from various and very ancient formations are known. 



