ONE-CELLED ANIMALS AND SPONGES. 
127 
which living cells are mainly- 
composed. 
Rhi zop'o da (Gr. rkiza , root, and 
pons), Protozoa having pseudo¬ 
podia for locomotion. 
Sar code (Gr. sarx, flesh) the fleshy 
part of a sponge. 
Si li'cious (Lat. si/ex, flint), made 
of a substance like glass. 
Spic'ule (Lat. dim. of spicum, a 
spike), a bit of hard material 
formed in the tissues of sponges 
and other lower animals. 
