214 



BIOLOGY OF THE PROTOZOA 



podium). In other cases the individual divides within the shell, 

 after which one of the daughter individuals moves out and forms a 

 new shell, while the other one remains in the original test {Micro- 

 gromia socialis, Clathrulina elegans, etc, Fig. 107). In most cases, 

 however, a novel method of shell duplication found in no other divi- 

 sion of the Protozoa, has been developed. This process, known as 

 "budding division," occurs throughout the group of the testate 



Fig. 107 '. — Microgromia socialis after Hertwig (A), and Microgromia sp. (B), original. 



rhizopods and is well illustrated by the classical example of Euglypha 

 aheolata first described by Schewiakoff (188S). Here after full 

 growth following vegetative activity of the individual, the pseudo- 

 podia are drawn in; water is then absorbed whereby the protoplasmic 

 density is greatly reduced and the volume increased. This is fol- 

 lowed by a process resembling pseudopodia formation, the proto- 

 plasm emerging from the parent shell opening as a ball or dome which 



