76 



THE ANATOMY OF INVERTEBRATED ANIMALS. 



escapes from the cyst, and recommences the predatory life of 

 its parent. In this case the myxopod becomes encysted, and 



Fig. 1 ^Protomyxa anrantiaca (Haeckel).— a, the Ptill condition surrounded by a 

 6tructurele!>!« cypt ; b, encysted form, the protophism of which is dividing ; c, tlie 

 cyst burstin<^ and jriviuirexit to tlie bodies into which t.lie protoplasm breaks up. 

 These are at first "monads," d, each bein<r provided with a fiasfelliforni cilium, 

 by meSns of which it propels itself (d). After a time each monad retracts its 

 cllinm, and resumes an Amoeba-like form {e\ ; many of these coalesce and form 

 a single Plasmodium, which prows and feeds under the form/. The specimen 

 fiirured contains a Per>din\nm (above), three IHciyocy^lcp (below), and two Mh- 

 whv (Diatomaceoup plants), in the centre. (Hacckel, " Studien iiber Mouereu," 

 1870.) 



