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).— a, the still condition surrounded by a 

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

 cyst bursting and giving exit to the bodies into which tlie 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 

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

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

 figured contains a Peridinium (above), throe Dictyocystcp, (below), and two IstJi- 

 micv (Diatomaceous plants), in the centre. (Haeckel, " Studien uber ^lonere!]," 

 1870.) 



