32 
Consists as in the before described species of cellulose) fig. 49. The emptied 
cell with its pear-shaped outline (velum), inner membrane and thread of 
attachment, hangs still on the stem of the plant (fig. 50). In the subse- 
quent quiescent state, the outer (velum) membrane shews a crenated or 
zigzag surface ; the cyst within is filled with red colored contents ; between 
it and the velum are seen the remains of food (fig. 51). 
This Monad was first seen by de Bary at a time when the abundant 
parasitic life of the Conferva was not recognised, and the whole phenomena 
were by this observer interpreted as belonging to the normal changes of 
the dying vegetable chlorophyll. Another and later observer, Karsten, 
thinks that the phenomena have some direct relation to the development 
of a wheel animalcule named Rattulus. 
The third species, Vamp. Vorax, became later known to Cienkowski. It 
differs from the others in several particulars. The two first named species 
are never seen to enclose foreign bodies such as Diatomacese, but live on 
the green chlorophyll of the confervoid plants ; the Vamp. Vorax on the 
contrary does not take in chlorophyll, but lives on Diatomacese^ Euglenas 
and Desmids. In examining the red colored balls which are so abundant 
on algee, some were found to contain different kiuds of diatoms, and Luders 
discovered the fact that small Amoebae were developed in these cells, which 
afterwards broke out through the enclosing membrane. 
The Aoemba of Vamp. Vorax is like that of the other species, but of a 
lighter red color and devoid of moving granules, (figs 52-3) The dimensions 
of the animal vary greatly ; when it lives on small Diatoms its cell remains 
small, but when feeding on the contents of long Synedra stems it grows 
quite large. Generally the size of the Monad cell strictly corresponds with 
the amount of aliment taken in. 
As it creeps by the Diatoms in its neighbourhood, the Diatoms stick to, 
and are finally drawn in, and involved in the Amoeboid plasm. With this 
uncomfortable burden the Amoeba moves about seeking fresh food. As it 
approaches its cell stage, the plasm so arranges itself as to contain its Diatom 
food in its long axis, (fig. 54) and corresponds in outer shape to the form of 
the Diatom whereby various forms result. The Vorax cell is simple (without 
velum) fig. 55 ; segmentation of contents goes on as in the other described 
species. In their encysted state no Diatoms are to be seen ; the contents 
ball together within a thick capsule, and remains of food lie outside the 
capsule (figs. 56-57). But this Vamp, species does not always live on 
Diatoms ; Desmids and Euglenre also serve as food ; in this case the cells 
are round and of a deeper red color, and remains of unassimilated food form 
