ALTERNATE PHASES IN. FOLLICULINA. 



77 



of the animal by a very slender strand that reached through the 

 hole in the tube to the rest of the animal still imprisoned. Within 

 the tube this slender strand became twisted as the outside part 

 swam in its usual spiral revolving way (Fig. 8) . Gradually, this 

 dark green strand was at first twisted, drawn out longer, made 



FIG. 9. FIG. 10. 



FIG. 9. Same at 10.05 when the anterior part swimming powerfully stretches 

 out both its own body and the connecting strand that binds it to posterior region 

 within tube. 



FIG. 10. Same at 10.10, showing change of direction of swimming that tends 

 to wind the connecting strand about the tube. 



an ever lengthening and very slender string connecting the 

 active outside animal with its dying foot (Figs. 8, 9, 10, n). 

 The animal revolving swung its head end in wide circles while 

 the slender string held its other end firm to the hole in the tube. 

 Moreover, the direction of pull exerted by the combined stroke 

 of the many cilia was changed so that the strain now pulled 



