8o 



E. A. ANDREWS. 



pushed them about as they ate into them. By 8 o'clock the 

 next morning (Fig. 14), August 31, nothing visible was left to 

 represent the old dead posterior end except a few of the scaven- 

 gers, six in place of thirteen, and these moved sluggishly, and the 

 following day only dead remnants were left, imprisoned in the 



FIG. 13. FIG. 14. 



FIG. 13. Same at 12.59 after the sedentary form has completed a spiral tube 

 and has assumed the mushroom form preparatory to finishing the secretion with 

 a terminal lip. The old posterior part within tube nearly all eaten up by scavenger 

 protozoans. 



FIG. 14. Same August 31, 8 A.M. after a planarian (which is indicated below 

 on right), had sucked out the sedentary folliculina when about to differentiate 

 into the perfect form. 



old tube base, as greenish detritus. The scavengers seemed to 

 be the ciliated protozoon, Urotricha. 



The anterior living part of the animal, however, outside the 

 tube while attached to the tube continued to advance in the 



