Phylum Protoplasta [201 



Hertwig and Lesser took note that the name Rhizopoda was originally applied to 

 organisms such as Miliola, which have rhizopodia; they proposed the name Sarko- 

 dina for all amoeboid organisms, with Rhizopoda as a subordinate group. Among 

 examples of Sarkodina which are not Rhizopoda, they listed first Difflugia, which 

 may accordingly be considered the standard genus. 



The Sarkodina as here presented are not assumed to be a natural group. Their 

 common characters are probably the outcome of degeneration, by which organisms of 

 diverse evolutionary origins have lost their distinctions. 



This assemblage is obviously and superficially divisible into two by the absence or 

 presence of shells. The resulting groups are construed as orders. 



Order 1. Nuda Schultze 1854. 



Family Amoebaea Ehrenberg Infusionthierchen 125 (1838). 

 Order Lofco^a Carpenter 1861. 



Order Gymnamoebae Haeckel Gen. Morph. 2: xxiv (1866). 

 Order AmoebinaKtnt Man. Inf. 1: 27 (1880). 



Suborder Amoebaea Biitschli in Bronn. Kl. u. Ord. Thierreichs 1: 176 (1880). 

 Order Gymnamoebida Delage and Herouard (1896). 

 Order Chaidea Poche in Arch. Prot. 30: 170 (1913). 



Subclass Amoebaea and order Amoebida Calkins Biol. Prot. 335, 337 (1926). 

 Order Amoebaea Kudo Handb. Protozool. 204 (1931). 

 Sarkodina without shells. The type is the common amoeba, Amiba diffluens. 

 1 Protoplasts not tending to form pseudoplas- 

 modial communities. 



2. Free-living Family 1. Amoebaea. 



Family 2. MAYORELLroA. 

 Family 3. TnECAMOEBroA. 

 Family 4. Hyalodiscida. 



2. Entozoic Family 5. ENDAMOEBroA. 



1. Protoplasts assembling and acting in unison 

 in pseudoplasmodial communities. 



2. Parasitic in plants Family 6. Labyrinthulida. 



2. Predatory on bacteria, in air on moist 

 surfaces; mostly producing complicated 



fructifications Family 7. Guttulinacea. 



Family 1. Amoebaea Ehrenberg Infusionsthierchen 125 (1838). Family Amoe- 

 bidae Bronn 1859. Family Chaidae Poche in Arch. Prot. 30: 171 (1913). Family 

 Chaosidae Chatton in Grasse Traite Zool. 1, fasc. 2: 58 (1953). The ordinary free- 

 living amoebas. SchaeflFer (1926) limited the family to forms which produce numer- 

 ous indefinite granular pseudopodia. There has been much confusion as to the iden- 

 tity of the species. There are apparently two species of common large amoebas: 



1. Chaos Protheus L. Syst. Nat. ed. 12: 1326 (1767) {Volvox Chaos L. Syst. Nat. 

 ed. 10: 821. 1758. Vibrio Protheus O. F. Muller Verm. Terr, et Fluv. 1: 45. 1773. 

 Pelomyxa carolinensis Wilson in American Nat. 34: 535. 1900. Chaos chaos Stiles). 

 Schaeffcr identified Pelomyxa carolinensis as the original Chaos Protheus L. It is 

 exceptionally large, being macroscopically visible, and is multinucleate. Surely, 

 sound nomenclature will apply to this species the name which Linnaeus gave it. 



2. Amiba [Amoeba] diffluens (O. F. Muller) Ehrenberg Infusionsthierchen 127 

 (1838) [Proteus diffluens O. F. Muller Animac. Infus. 9. 1786; there is an older genus 



