657 
e 
and the Flagellata. 
specialized non-granular protoplasmic end are attached the 
cilia, protoplasmic in nature, which perforate the cell-wall. 
Here also are the two small contractile vacuoles which, pro¬ 
bably excretory in nature, contract and recover once a minute 
or so. The chloroplast contains one large pyrenoid of a 
proteid nature in the centre of its thick basal part. The 
x x % ■ 
