1 86 From Matter to Man. 



which touch its ephemeral tentacles, buries them in 

 its body, and slowly digests them. The likeness of 

 this animal to the vegetal sun-dew is striking, the 

 only essential difference being that the sun - dew 

 possesses roots and a stem. Some allowance for 

 lesser activity must also be conceded to the sun-dew, 

 as an organism trammelled by cellulose membranes 

 and tissues rather than fitted with albuminous en- 

 velopes. 



The heliozoa reproduce by fission and encystment 



Sporozoa. — The sporozoon is a minute animal, para- 

 sitic in all classes and orders of animals. It differs 

 from the preceding protozoa in possessing a firm outer 

 layer. It reproduces by conjugation and encystment. 



Flagellata. — These animals are nucleated cell-bodies, 

 provided with one or more large processes of vibratile 

 protoplasm. Some have a mouth, but in others im- 

 bibition as in plants takes place, chlorophyll being 

 present. Many flagellata construct collar-like out- 

 growths or stalk-like processes, others gelatinous shells 

 or cups arranged in aborescent colonies. 



Reproduction in more simple forms is effected by 

 conjugation and fission, but, in the volvocina, sexuality 

 reaches a high degree of modification in the copula- 

 tion of the male spores (microgonida) with the female 

 cells (macrogonidium). Some colonies, moreover, only 

 produce male spores, others only female egg-cells. 



Some flagellata have one or two pigment cells 

 called " eye spots," but whether they subserve the 

 function of sight has not yet been determined. 



