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plasms in one string. Fig. 5, the state of rest, in which the animal is 
shrouded in a capsule of matter formed on its outer surface, whilst within 
it is seen a mass of Zoospores in process of development, and a smaller 
mass of refuse aliment. The Zoospores are spindle-shaped, exhibit very 
active contractile movement, (wriggling like Anguillulse), and they are 
supplied with pointed ciliae or flagellae. The M. Amyli is found attached 
to decaying Nitella Plants. 
The life-history of this creature is here unfolded. It may be said to begin as 
a Zoospore, in which state it is not distinguishable from the moving germs 
or Zoospores of Algs9 and Fungi. This Zoospore next becomes a soft con- 
tractile mass of plasm, furnished with one or more cilise, and now takes 
in food through its substance, growing therefore in size. The feeding phase 
complete, it ceases to move about, and acquires a capsular envelope — 
becomes, in fact, a pseudo-cell without nucleus. Before all the imbibed 
nutriment is assimilated, the generation of young Zoospores begins with- 
in the capsule. One remarkable feature of its middle-life is the well- 
ascertained fact, that several such plasms fuse into one individual. This 
was not observed by Cienkowski to take place in any other known Monad, 
and in so far, he considered it, peculiar to the Monas Amyli. But the 
Zoospores of Fungi (myxomycetse) growing in mucus, were discovered by 
De Bary to resemble those of the M. Amyli not only in becoming Amoeboid, 
but also in their capacity of fusing together and forming an indefinite net- 
work of contractile plasm. From this stage, however, the parallel between 
the two fails, and the mode of fructification differs. In the Protomyxa of 
Haeckel, the combination of many individual Zoospores into one network 
connecting them together is observed as a special character. To this con- 
nected colony of Zoospores the name plasmodium is given. 
Cienkowski describes further certain spore-forming Monads— under 
the names Pseudospora (Monas) parasitica, P. nitellarum, and P. volvox. 
Figs. 6-11 indicate the life-phases of P. par.; but here we find the Zoospore 
becomes a true Amoeba, for the minute body of plasm contains a nucleus 
and two or three contractile vacuoles, also cilice. The cyst of later develop- 
ment is a simple membrane. Hseckel accordingly excludes it from his list 
of Monera. Figs.. 12, 13, shew Pseudospora nitellarum. Its Zoospore 
resembling a spermatozoon, and its capsular envelope double, with a 
considerable interspace; its Amoeba is organised, as that of the P. 
parasitica, and consequently Hgeckel rejects it as a Moner. 
I may as well here observe that the definition of a Moner by Hseckel 
has relation to the physiological status of the animal — that is to say, to 
