The Sarcodina 223 



V'. 



■'mi: 



^^'i *-/'■■■'■■■ 

 B \ '^ 





•' c 





vs 



■%.'i. 



Fig. 5. 16. A-D. Vampyrella lateritia Leidy, schematic (after Hoogen- 

 raad): specimens showing different forms of pseudopodia (AC); organism 

 ingesting contents of a Spirogyra cell. E-G. Vampyrella closterii I'oisson and 

 Mangenot (after P. and M.): E. Specimen attached to Closterhim and ingest- 

 ing contents of the alga; xl58. F. Cyst attached to empty cell wall of 

 Closterium; xl58. G. Section of cyst showing central mass of ingested food, 

 nuclei, mitochondria, and a peripheral zone of neutral-red-stainable vacu- 

 oles; x563. H, I. Arachnula impatiens Cienkowski (after Dobell): small speci- 

 men with a number of nuclei and several contractile vacuoles, x200; cyst 

 with several nuclei and ingested diatoms, x500. 



suggested that Pseudospora may belong in the Dimastigamoebidae (Order 

 Amoebida) rather than in the Proteoinyxida (127). 



Family 3. Vampyrellidae. The mature stage, in the type genus, is a 

 fairly large plasmodium. Reproduction involves plasmotomy, and multi- 

 nucleate cysts are formed by plasmodia. These general characteristics are 



