.4 STUD) OF \U\ED PROTOZOA \ CULTURES 00 



1)1). With Rnt'ii (•lin)iiiaU)|)l»»n;s. 



K. (xjloiiy fhit (cells in one plants of 4 t<> li> iiniivulualN; llaKullu 



(lirccteil fn)in one .surface dimium 



EE. Colony spluMoidal. 



F. Indivitlual.s ('(lual in size. 



G. IndiNaduaLs crowded, inner ends pointed and reaching 

 center of mass; colony enclosed within definite mem- 

 brane; two long flagella Pandorina 



GG. Individuals scattered in jelly mass (not crowded); two 



fiagella Eudorina 



FF. Individuals not all of .same size (.smaller ones vegetative, 

 larger ones germinal). 

 G. No protoplasmic connections between celLs; larger germ 

 cells at posterior pole of colony (i.e., poles of colony 



difTerentiated) Pleodorina 



GG. Protoplasmic connections between cells distinct; poles 



of colony not differentiated Volvox 



HM. locomotor organs in form of pseudopodia which may be changeable, 



blunt, fine, or raylike and rigid Class Sarcodina 



(". Pseudopodia fine and raylike; no outer envelope or .shell, body 

 rounded. 

 D. Ectoplasm not distinctly differentiated, axial filaments of 



pseudopodia extending to nucleus Adiiwphrys 



DD. Ectoplasm distinct, axial filaments extending to ect«plasn> 



.4 clinosphaeri u m 

 CC. Pseudopodia not raylike but changeable and flowing; body form 

 irregular. 



D. Body naked (without test) -i "'<^ba 



DD. iJody with test. 



E. Test chitinous, smooth, hemispherical in form, pro\nded on 

 its flat surface with circular opening through which pseudo- 

 podia extend Arcella 



EE. Test covered with minute foreign bodies and therefore 



appears uneven Difflugui 



A A. Ciha present as locomotor organs Class Infusona 



B. Mouth surrounded by a spiral zone of large ciiia. 

 C. Free-living, membranelle winding to left. 

 D. Entire surface of cell covered with cilia. 



E. Adoral zone (fringe of fused cilia near mouth) nearly at right 

 angles to body axis; cell trumpet shaped; free swimming 

 (or may become attaciied temporarily but without special 



stalk) Stenlor 



EE. Adoral zone paralleling body axis. 



F. Adoral zone funnel shaped, sunken in the body; cell oblique 



in front Bursaria 



FF. Adoral zone narrow, elongate, reaching middle of body, 



which is elongate in appearance Spirostomum 



DD. Ventral surface with cirri (long cilia fused together to form 

 bristle-like appendages, which are sometimes used as legs); 

 dorsal surface with only fine cilia or none. 



