522 CLASS ECHINODERMATA. 
changes every moment, and successively assumes all kinds of 
limits, sometimes rounded, and compact, sometimes divided 
and subdivided into strips in the most fantastic manner. 
(Proteus diffluens, Reesel.) 
Monas, Miill., 
Resemble, in the microscope, little horns, which move with 
great quickness, although without any apparent organ of 
motion. 
VoLvox, 
Have a small globular body revolving on itself, and often 
enclosing smaller globules, which, doubtless, serve to pro- 
pagate the race. 
