SPOROZOA 



43 



grow up they frequently become stalked like Vorticella, but they lose 

 their cilia and acquire instead a number of stiff rod-like outgrowths 

 ending in knobs ; these structures are termed tentacles. These are 

 able in some way which we do not understand to seize small animals 

 and suck out their contents. Some secretion must be produced which 

 eats its way through the cuticle and dissolves the contents of the 

 prey. Suctoria have micronuclei and conjugate like Ciliata. 



FIG. 15. Clepsidrina longa, from larva of Tipula, the Daddy-long-legs. 

 Highly magnified. From Leger. 



A, B, C, D, E. Stages of the development of G. longa, at first within and then 

 pushing its way out of one of the cells of the intestine of the Tipula larva. 

 F. Mature form. G. Two forms conjugating. 1. Cell of intestine 

 of host. 2. Its nucleus. 



The last group of Protozoa, the Sporozoa, agree with the 



s orozoa Flagellata in showing a great range of forms, the 



lowest of which can emit pseudopodia whilst the more 



highly specialised possess a well developed cortical layer with 



myonemes. None possess cilia or flagella ; their movements, which 



are very sluggish, are carried out entirely by contractions of the 



cortex, which give rise to worm -like wrigglings. The name, 



