36 BRITISH FRESHWATER RHIZOPODA. 



CLASS S ARC ODIN A. 



Protozoa naked or testaceous, possessing, in matu- 

 rity, digitate, lobose, finely reticulate, or radiate 

 pseudopodia, the latter with or without axial filaments. 

 Reproduction by spore-formation or simple division. " 



SUB-CLASS RHIZOPODA. 



Naked or testaceous Sarcodina, with pseudopodia 

 of the lobose, digitate, acicular, or reticulate types. 

 Adult forms amoeboid ; young (spores) amoeboid or 

 flagellate, produced by cell-division during life or 

 following encistment. In some forms (e. g. Vampi/rella 

 vorax) individuals fuse to form plasmodia. 



Order I. AMCEBINA. 

 Plasma-body naked. 



Family 1. LOBOSA. 



Naked Khizopods with lobose, or more or less digi- 

 tate, elongate, sharply pointed or blunt pseudopodia, 

 or with wave-like or hernia-like expansions of the 

 ectoplasm. 



Genera : (1) Amoeba, (2) Dactylosphderium, (3) Masti- 

 gamoeba, (4) Pelomyxa, (5) Lithamoeba, (6) Ouramceba. 



Family 2. RETICULOSA. 



Naked Rhizopods with filamentous anastomosing 

 pseudopodia. 



Glenera : (7) Gymnophrys, (8) Biomyxa, (9) Penardia, 

 (10) Chlamydomyxa. 



Family 3. VAMPYRELLIDA. 



Naked Rhizopods with amoeboid movements and 

 variable pseudopodia, sometimes radiate, simulating 



