PSEUD0»HELIOZOA. 



67 



Flagellata. An account of several sucli forms is given 

 lay Penard, in addition to which the following may be 

 noted : Giliopli,rys Cienkowski has two phases ; in the 

 one it appears as a typical Heliozoon with stiff 

 radiating pseudopodia; in the other it is a typical 

 flagellate. 



" In the process of transformation the Heliozoon- 

 form retracts its pseudqpodia, its body becomes 

 amoeboid and a flagellum grows out ; finally the animal 

 becomes a pear-shaped flagellate swimming by means 

 of its flagellum (Schewiakoff ; Caullery). 



Fio. 19i. — Olathrella foreli. 1. Usual appearance. 2. Envelope (partly 

 diagrammatic) . 3. Young individual. (After Penard.) 



" Gbliophrys thus recalls Pseudospora in its two 

 phases, and there can be little doubt that the two 

 forms are closely allied." 



After describing Diviorpha nmtans the author pro- 

 ceeds : " These facts appear to indicate an origin for 

 the Heliozoa from Flasrellates such as those of the 

 genus Multicilia, in which the body bears radiating 

 ilagella planted evenly over the surface ; transforma- 

 tion of the flagella into stiff pseudopodia would pro- 

 duce the Heliozoon-type of organism. On such a view 

 two peculiarities of the Heliozoan pseudopodia receive 

 explanation ; the power of nutation and bending which 



