HOLOTRICHA 



743 



ogy and physiology (Miiller, 1932); contractile vacuoles (Dimitrowa, 

 1928); cytopharynx (Gelei, 1934); calcium and iron (Kruszynski, 

 1939); nuclear variation (Diller, 1940); re-conjugation (Diller, 1942); 

 food vacuoles (Bozler, 1924); conjugation (p. 187). 



P. aurelia E. (Figs. 2, g, h; 57; 89; 100; 101; 102; 316, 6). 120-180/z 

 long; two small vesicular micronuclei, a massive macronucleus; two 

 contractile vacuoles on aboral surface; posterior end more rounded 

 than P. caudatum; in fresh water. Nutrition (Phelps, 1934); autog- 

 amy and hemixis (Diller, 1936); conjugation and mating types 

 (p. 190). 



■1 / 



Fig. 316. Semi-diagrammatic drawings of nine species of Paramecium 

 in oral surface view, showing distinguishing characteristics taken from 

 fresh and stained specimens, X230 (several authors), a, P. caudatum; 

 b, P. aurelia; c, P. multimj,cronucleatum; d, P. bursaria; e, P. putrinum; 

 f, P. calkinsi; g, P. trichium; h, P. polycaryum; i, P. woodruffi. 



