LIFE HISTORIES OF THE PROTOZOA. 735 
contents divide into three portions, each of which becomes an 
Ameba-like being (Fig. 129, B, showing one creeping out of the 
‘ A . ~s > 
cell, œ. C, D, E, the Ameceba-like stage). Finally one of these 
Fig. 129. 
Development of Vampyrella. 
Ameeba-like forms becomes encysted (Fig. 129, F, y, the food- 
granules; t, cell-wall of the cyst). To sum up the life-history of 
Vampyrella as observed by Cienkowski, we have : — 
1. An Ameeba-stage. 
2. A cell-stage. 
A second Ameeba-stage. 
. An encysted stage. 
So exactly does this mode of development parallel that of Col- 
podella pugnax described by Cienkowski, who regards it as a fla- 
gellate infusorian allied to Monas, that we doubt the naturalness 
of Heckel’s division of Monera. Colpodella and in fact Proto- 
monas differ from the Monads (Flagellata) simply in having no 
nucleus. Whether this may not be found on further observation, 
ant as Heckel 
He os 
. 
or whether its absence or presence is SO import 
thinks, future observation will show. We are now inclined to re- 
gard the Monera as a somewhat artificial group. It should be 
noticed that none of the other Moners have a ‘¢ cell-state,” but the 
Ameceba-like organism becomes encysted at once after becoming 
fully fed. 
The development of Myzxastrum radians of Heckel is much like 
