. The British freshwater Rhizopoda and Heliozoa. digestion,or whatever else, in the life of the unicellular organism,is expressed by constant chemical interchange betweenthe cytoplasm and the nucleus. Means oy Locomotion. Except in a small number of species, the Rhizopodaare endowed with the power of locomotion through * Op. cit., p. 278. 10 BRITISH FRBSHWATEB EHIZOPODA. the agency of pseudopodia. In the Amoebina, ArceUida,and other lobose forms, these changeable processes are usually few in number, short, digitate, and bluntat the tip; or they may be broad and lobose—in theAmo-hie they are mo

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. The British freshwater Rhizopoda and Heliozoa. digestion,or whatever else, in the life of the unicellular organism,is expressed by constant chemical interchange betweenthe cytoplasm and the nucleus. Means oy Locomotion. Except in a small number of species, the Rhizopodaare endowed with the power of locomotion through * Op. cit., p. 278. 10 BRITISH FRBSHWATEB EHIZOPODA. the agency of pseudopodia. In the Amoebina, ArceUida,and other lobose forms, these changeable processes are usually few in number, short, digitate, and bluntat the tip; or they may be broad and lobose—in theAmo-hie they are most frequently so—whilst in theEuglypliai and others, included in what Leidy classedas the Filosa, they are acicular, sometimes short, butmore frequently of considerable length, and capable ofbranching, and also, in a small number of forms, ofanastomosing. These acicular pseudopodia may berigid and susceptible of little apparent change forlonger or shorter periods ; often, however, they changerapidly, or they may whilst fully extended (e.

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