236 The Sarcodina 



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Fig. 5. 25. Various types of amoeboid activity in Amoebidae: A. Locomo- 

 tion without formation of distinct pseudopodia, cctoplasmic ridges distinct, 

 as in Tliecamoeba verrucosa. B. Formation of conical pseudopodia along 

 anterior margin and on free siuface during locomotion, as in Mayorella 

 bigemma. C. Formation of large pseudopodia which direct locomotion, as in 

 Amoeba proteus. D. Formation of a ninnber of large pseudopodia, including 

 several which direct locomotion, as in Amoeba dubia. E. Floating form with 

 slender and sometimes spiral pseudopodia, as in Astramoeba flagellipodia. 

 F. Slug-like forms moving by protoplasmic flow, as in Trichamoeba clava; 

 uroid (slender cytoplasmic projections at posterior end) present. G-L. Loco- 

 motion of "walking" type, as seen in thriving cultures of Chaos (Pelomyxa) 

 carolinensis. M-O. Acanthamoeba castcUanii (Douglas) \'olkonsky (12-30/i), 

 showing different forms of pseudopodia in one species. A-F, schematic (after 

 Schaeffer); G-L, schematic (after Wilber); M-O, after Volkonsky. 



