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.) 



<z. 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. II. I i 



