68 



TEXTBOOK OF ZOOLOGY 



Shell of sand cemented together by a secretion, are two of the most 

 commonly observed shell-bearing forms, (b) Foramimera is an 

 order of shelled forms whose pseudopodia are very slender a^d 

 reticnlar. The pseudopodia are extended through small pores m the 

 sheU Only a very few of this group live m fresh water. The vast 



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iU- e 



Fig. 25.-Life cycle of one of the Foraminifera PoZysfomeZZa crw^^A^ 

 spheric individual; B amoeboid 9^11^ .f.^^P^^^ from it ^ youn^^^ 

 dividual developing from amoeboid cell ;D,nmcrosphericin^^^^ Parker and 



gametes escaping from it ; F, union of gametes. Kearawn 

 Haswell, Zoology, published by The Macmillan Co.) 



