The Sarcodina 203 



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Fig. 5. 1. Helioflagellida. A. Acinetactis arnaudoffi Valkanov; two fiagella. 

 granular axopodia; x800 (after V.). B, C. Dimorphella elegans Valkanov; fiag- 

 ella and axopodia arising from a central gianule (B); stage in division (C); 

 x2400 (after V.). D, E. Ciliophrys marina Caullery;" axopodia retracted in 

 flagellate stage (D); granular axopodia extended (E); x960 (after Griessmann)'.' 

 F-H Tetradimorpha radiata Hsiung; axopodia extended, nucleus central, x325 

 (F); typical swimming stage, x480 (G); stained preparation showing nucleus, 

 blepharoplast, axonemes of retracted axopodia (H), x490 (after H.). I-J. Di- 

 morpha mutans Gruber; axopodia and flagella arising from a central granule 

 (I); axopodia retracted (J); xl060 approx. (after Blochmann). K. Actitiomonas 

 mirabiUs Kent, one flagellum, axopodia extended; xl360 (after Griessmann). 



Order 2. Heliozoida 



The Heliozoida possess radially arranged axopodia which rarely 

 anastomose, and typically contain globules or granules. A flow of granules 

 along the axopodia is characteristic. The finer structure of the pseudo- 



