THE THRESHOLD OF EVOLUTION. 
155 
retracted itself from the inside of the wall of the cyst, which has 
become thickened, and has begun to divide into numerous small 
globular bodies. Between the plasma-ball and the outer covering 
a little clear fluid has collected.’ 
Fig. 7. The same further developed. 
Fig. 8. 1 The small globular bodies have now drawn themselves out into a 
long tail, and issue from the cyst as swarm-spores, with a lively 
motion.’ At e, ‘ the pear-shaped spores, having ruptured the cyst, 
move about freely with the aid of their tails.’ At f, some ‘ spores 
becoming stationary retract their tails and protrude pseudopodia,’ by 
means of which they creep about after the manner of Amoeba. 
Fig. 8, g, shows 1 three of these Amoeboid germs united into a 
single plasmodium ; ’ vacuoli being now for the first time observable. 
Fig. 9. Myscastrum radians , another typical Moneron in the Amoeboid or 
Actinophryan stage : not quite full-grown. 
Fig. 10. The same after arriving at full growth, encysted, 1 showing the 
homogeneous colourless ball of protoplasm, surrounded by a tough , 
structureless, gelatinous, covering.’ 
Fig. 11. The same , 1 at commencement of development, dividing by radial 
cleavage into numerous conical portions.’ 
Fig. 12. The same, still further developed. 1 The cone-shaped masses have 
now assumed a spindle-shape, and each separate one has developed 
a siliceous covering.’ 
Fig. 13. The empty siliceous shell of one of these ‘ spores 
Fig. 14. 'A spore, showing the protoplasmic contents escaping from the 
siliceous shell.’ 
