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. l.—Protomyxa avrantiaca (Haeckel 1 ).— a, the still condition surrounded by a 

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

 cyst bursting and {riving exit to the bodies into which the protoplasm breaks up. 

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

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

 cilinm, 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 Perldinium (above), three Dictyocystce. (helow), and two Isth- 

 mifp (Diatomaceous plants), in the centre. (Haeckel, '* Studien fiber Monereu," 

 1870.) 



