HOLOTRICHA 



609 



end and bluntly pointed narrow posterior end; preoral canal wide; 

 a dorsal ridge in posterior region of body; macro nucleus sausage- 

 form; a micro nucleus; contractile vacuole in middle of body, with 

 long collecting canals; in fresh water. 



Fig. 288. a, Frontonia leucus, XHO (Kahl); b, F. branchiostomae, X490 

 (Codreanu); c, Disematostoma biitschlii, X340 (Kahl); d, Lembadion bid- 

 linum, Xl70 (Kahl); e, Tetrahymena geleii, X950 (Furgason); f, Leuco- 

 phrys patula, X280 (Man pas); g, Colpidiiim colpoda, XlSO (Kahl); h, i, 

 Lambornella stegomyiae, X340 (Keilin); j, Paraglaucoma rostrata, X400 

 (KaM)]k, Malacophrysrotans, X 500 (Kahl). 



