THE FOEAMINIFEEA 



a 



seaweed, and they can then be observed with 

 moderately powerful lens. 



Living Foraminifera are very beautiful objects 

 when viewed by means of a back-ground illumination, 

 using an objective of about 40 diameters. The shell 

 under these conditions appears surrounded by a sort 

 of cobweb of extremely fine sarcode threads, which, if 

 observed closely, will be seen to exhibit a streaming 



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Fig. 3. — Haplophragmium [JMonionina siliceaJ with 

 Extended Pseudopodia. x 72. After Schtdtze. 



movement, owing to the rapid circulation of crystalline 

 particles in the sarcode, reminding one of the cyclosis 

 or circulatory movements seen in the cells of certain 

 plants. A reproduction of Schultze's figure of a 

 living HaplojyJiragmiuDi, giA'en above, affords a good 

 idea of the appearance of the living organism (fig. 3). 

 Hoiv to find Fossil Foraminifera. — Fossil speci- 

 mens may also be obtained with very little difficulty ; 



