36 GENERAL ORGANIZATION OF THE PROTOZOA 



filaments, while an artodiscus dances about the field with an energetic, 

 but erratic movement due to the springiness of the tips of its axiopodia. 



Lichnaspis giltochii, Haeck. One of the Actipylea. (After Haeckel.) The spines are 

 arranged in accordance with the Miillerian law as follows: a, a, a, a, northern polar spines; 

 b, b, b, b, northern tropical spines; c, c, c, • — equatorial spines; d, d, d, d, southern tropical 

 spines; and e, e, e, southern polar spines. 



In some forms both flagella and these pseudopodia exist at the same 

 time, as in dimorpha or in myriophrys, while in the former the one 

 may change into the other. These axiopodia, therefore, are of con- 



