60 



ZOOLOGY 



SECT. 



(Fig. 42, 2, #.), in other cases it is surrounded by a capsule of loosely 

 woven fibres through which the pseudopods pass, thus reminding 

 us of the state of things characteristic of perforate Foraminifera. 



v v1.Rctf>hidiof)hrys 



b : ^2^ 



i ^^= 



2.Nuclearia 



3.Cla/-hru.lina 



FIG. 42. Various form* of Heliozoa. 3a, the entire animal ; 3b, the flagellula ; c. rac. 

 contractile vacuole ; g. gelatinous investment ; nu. nucleus ; psd. pseudopods ; st 



siliceous skeleton ; .^/. ^.i.-ules. (From Biitschli's Protozoa, after Schulze and (ireeff.) 



One genus has a shell formed of agglutinated sand-grains ; in 

 another (Fig. 42, 7) the skeleton consists of loosely matted needles 

 of silica. Lastly, in the graceful Glatlrrulina (3) the body is 



