83 
brown colored balls in the middle. The Amoebse born of these cells are 
smaller and more colored than those born from cells of V. Vorax that has 
fed on diatoms. The quiescent state shews the cyst surrounded by a more 
sac-like velum with appendages, and a larger amount of undigested food. 
The above described Monads belong to Hseckel's genus Moner. Cien- 
kowski however describes another creature, which although differing by 
certain marks of higher organization, deserves notice here as completing the 
strange history of the predatory feeding habits of the Monad. This creature, 
■ called Nuclearia delicatula, appears as an Amoeba with pointed pseudopods. 
Its substance is soft, delicate, and colorless, contains a number of Vacuoles, 
which slowly disappear and reappear ; and also several (1 to 5) clear 
cytoblasts or nuclei with strongly refracting nucleoli, (fig. 58, 59, 60) It 
often throws out rays at several points, but sometimes is without rays, 
and multiplies by fissation (fig. 60). 
This Amoeba sucks out the remains of chlorophyll left by V. Vorax, &c, 
and even attacks the Vampyrellse themselves . A crowd of Nuclearise may 
be seen around the putrescent Spirogyrse stems, sucking in greedily their 
starch particles. In order to get at these the Nuclearia draws itself into a 
pear shape, with one or more long streaks or tails of hyaline substance, 
which it inserts into the almost empty Spirogyra stem. Inside the stem 
or cell membrane of the plant, the threads run into each other forming an 
intricate plexus or plasmodium network (fig. 61). The substance of the 
protoplasm threads surrounds the chlorophyll particles enclosing them with 
a thin covering ; then the principal thread or tail retracts, and thus pulls 
out the chlorophyll entangled in the finer threads. Properly speaking there 
is no suction (as is seen in Acinetae) . If the Nuclearia has fastened upon a 
stem nearly full of chlorophyll, it simply attacks it with a short projected 
pseudopod, but it can only bore into stems that are softened by putrescence. 
If the animal can come in directer contact with its food, it simply encloses 
it like an ordinary Amoeba. It is clearly not a Monad though feeding 
like it. Possessing nuclei and vacuoles, it stands in organisation equal 
with the typical Amoeba. Its further history is not known, but it enters 
into encysted condition ; in a small and simpler example of Nuclearia the 
production and escape of young Amoebae were observed. This Nuclearia 
simplex has a colorless and nucleated Amoeba (fig. 62). It lives on 
chlorophyll and vegetable starch grains, and entersreadily into the quiescent 
state, which consists of a cell with outer membrane, within which is a 
colorless cyst much smaller than the cell membrane ; within this cyst a 
young Amoeba forms, which creeps out through a small opening in the cyst 
wall and cell membrane (figs. 63, 64). 
