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 aurantiaca (Haeckell.— a, the still condition surrounded by a 

 structureless cyst ; b, encysted form, the protoplasm of which is dividing: c, the 

 cyst bursting and <_ r i\ Ingexit 1o the bodies into which the protoplasm breaks up. 

 These are at first "monads," d. each being provided with a flagelliform cilinm, 

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

 cilium, and resumes an Amoeba-like form (e) ; many of these coalesce and form 

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

 figured contains a Perklinium (above), three Dicfi/ocyxtce (below), and two Isth- 

 mice (Diatomaceous plants), in the centre. (Haeckel, " Studien fiber Moneren," 

 1870.) 



