THE BEGINNINGS OF LIFE. 



481 



surface. Sometimes the cilia were motionless, and lay 

 like a halo of short radii round its circumference, though 



FIG. 88. 



Mode of Origin (?) and Development of Otostoma. (Carter.) 

 (x 200.) 



a. Nitella-spheres. Cilia not represented. 



b. Smaller body of same kind enclosed within a cyst, which at length 



becomes transformed into two ciliated embryos (c). 



d. Outline appearance of embryo Otostoma soon after its emergence 



from the cyst. 



e. More developed form of same lateral aspect. 



/. Front view of adult Otostoma showing ear-shaped buccal orifice, 

 and contracting vesicle with radiating canals. 



the sac was otherwise gradually changing its shape- 

 while at others there was no appearance of cilia at all. 

 On the other hand, sometimes the sac was rotating 

 VOL. n. i i 



