298 



PLASMODROMATA AND SARCODINA 



Classification. — ^This class may be divided into subclasses as 

 follows : — • 



(a) With blunt loose pseudopodia which do not anastomose — 

 AmcebcB. 



(6) With fine branching and anastomosing pseudopodia — 

 Foraminifera. 



Remarks. — Only the Amoebae concern us. 



SUBCLASS: AMCEBiE Ehrenberg, 1830. 



Synonyms. — Amcehina Auctores (a misprint); Chaidea Poche, 

 1913; AmcehidcB Brown, 1859. 



Definition. — Rhizopoda, parasitic or free-living, with blunt, loose 

 pseudopodia which do not anastomose. 



Classification. — The subclass Amoebae may be divided into two 

 orders as follows : — 



[a] Without a shell — Gymnamcehida. 

 lb) With a shell — Thecawcehida. 



ORDER I. GYMNAMCEBIDA Delage Herouard, 1896. 



Synonym. — Lohosa Carpenter, 1861; AmceUdce Broun, 1859; 

 ChaidcB Poche, 191 3. 



Definition. — Amoebae without a shell, but with a tendency of the 

 peripheral plasm to harden into a membrane-like zone. 



Type Genus. — Amoeba Bory de St. Vincent, 1822. 



Remarks. — 'The genera of this order are in a wild state of con- 

 fusion. Calkins in 191 2 gave a large number of genera — Amoeba, 

 Vahlkamfia, Naegleria, Craigia, Trimastigamoeba, Entamoeba, 

 Paramoeba, Trichospherium, Hyalodiscus, Chromaletta, Pelomyxa, 

 Dactylosphera, Nucleophaga. In the same year AlexeiefE created 

 the genera Naegleria and Hartmannia for Amoebae of the limax 

 type, and also Proctamoeba for Amoebae parasitic in vertebrates, 

 but the two last names have not come into general use. Doubtless 

 many more exist. 



Classification.— Those found in man up to the present may be 

 classified into : — 



1. Loeschia Chatton and Lalung-Bonnaire, 1912. 



2. Vahlkamfia Chatton and Lalung-Bonnaire, 1912. 



3. Craigia Calkins, 1912. 



4. Dientamceba Jepps and Dobell, 1918. 



They may be differentiated as follows: — ■ 

 A. Without uniflagellate stage : — • 

 I . Typically uninucleate : — 



Ecto- and endoplasm distinct when moving. Nucleus 

 with or without visible karyosome and centriole. 

 Contractile vacuoles generally absent. Division 

 by mesomitosis — Loeschia. 



