HOMOGENBEA. 423 
The most singular genus of the whole is the 
Proteus, Lin. 
No determinate form can be assigned to them; their figure changes 
every instant, and is sometimes rounded, sometimes divided and 
subdivided into thongs, in the most odd and singular manner(1).. 
Monas, Mull. 
The Monades, viewed under the microscope, resemble points moving 
with great rapidity, although destitute of any apparent organ of mo- 
tion. 
VoLvox. 
A globular body revolving on its axis and frequently containing 
smaller globules which are doubtless the continuation of the race. 
(1) Proteus diffluens, Rees., MI, ci; Encyc., I, 1, a—m;—Prot. tenax, Miill., Inf., 
I, 13—18; Encyc., I, 2, a—f. 
For other details concerning all these animals, see the posthumous work of 
Othon Frederick Miiller, entitled, A4nimalcula Infusoria, the plates of which have 
been copied in the Encyc. Méthodique. See also Res., III, and for the classifica- 
tion, the work already quoted of M. Bory Saint-Vincent. 
(2) M. Audouin and M. Edwards, Ann. des Sc. Nat.; XI, pl., XVI have adopted 
this opinion of M. Grant. 
