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CLASS SARCODINA. 

 SUB-CLASS RH1ZOPODA. 



Order I. AMCEBINA. 



Family 1. LOBOSA. 



Naked Rhizopods, with lobose, or more or less digi- 

 tate, elongate, sharply pointed or blunt pseudopodia, 

 or, in place of these, and serving the purpose of loco- 

 motion, wave-like or hernia-like expansions of the 

 ectoplasm. 



SYNOPSIS OF THE GENERA. 



Plasma-body naked (in one species clothed with fine 

 spicules) ; in size very variable ; pseudopodia digitate 

 and extensile, or taking the form of lobate, wave-like, 

 or hernia-like expansions ; nuclei one or more (usually 

 single) ; contractile vacuole mostly single. 1. Amoeba. 



Pseudopodia radiate, rigid when at rest, often for 

 considerable periods, widely extensile, blunt at the 

 apex and linear, or tapering to a fine point ; straight 

 or curved, sometimes bent at an angle, or spirally 

 twisted. Uninuclear. * Contractile vacuole usually 

 conspicuous. 2. Dactylosphserium. 



Flagellate, the single flagellum extended in front 

 during progressive movement of the individual ; the 

 plasma-body and pseudopodia, in adult examples, 

 habitually covered with fine, hardly perceptible bacilli- 

 form spiculse, or naked. Uninuclear. 



3. Mastig amoeba. 



Plasma-body naked, multinucleate ; contractile vacu- 

 oles inconspicuous ; pseudopodia lobular or wave-like, 



