MICROTJENIELLA CLYMENELL^E. 



47 



All intermediate stages between this young form and stages 

 pictured in Figs. 4 and 5 were found. Each satellite contains a 

 single nucleus except in the division stages and in the terminal 

 cells of the oldest satellites. 



New cells are continuously given off by the primitc; these 

 reproduce by division, the plane of division being at right angles 

 to the long axis of the aggregate for the first one or two divisions. 

 In some chains the successive individuals furnish almost every 

 stage for an ideal diagram of cell division (Fig. 3). In the older 



m& 



&&(-' 

 p<M 



^"Sk -& 



satellites the plane of division changes from transverse to longi- 

 tudinal in respect to the long axis of the chain. In this \vay 

 two terminal chains may originate, but such branch chains never 

 become very long owing to further development and to separation 

 of the satellites from the parent colony. 



After from eight to ten satellites have been produced thus by 

 division, the terminal cells become more spherical, their nuclei 

 divide twice, and without cytoplasmic division, giving rise to a 

 terminal group of cells each with four nuclei (Fig. 4). This stage 

 must persist for some time for several specimens were found 



