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 



Pig, \.—Protomyxa aurantiaca (Haeckel).— «, the etill condition Burrounded by a 

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

 cyst bursting and giving exit to tlie bodies into wliich tlic protoplasm breaks up. 

 These are at first "monads," d, earh beine provided with a fiagelliform cilium, 

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

 cilium, and resumes an Amoeba-like form ie^ ; many of these coalesce and form 

 a single Plasmodium, whicli irrows and feeds under the form/. The specimen 

 figured contains a Peridwvim (above), three Dicfyocyfta; (below), and two Isth- 

 micp (Diatomaceous plants), in the centre. (Haeckel," " Studien iiber Mouereu," 

 1870.) 



