HOLOTRICHA 



573 



coarsely ciliated; caudal bristle thin; cytostome at anterior end, 

 surrounded by longer cilia; cy to pharynx small with tricho cysts; 

 round macronucleus central; contractile vacuole near posterior end; 

 40-55/i ; fresh water. 



Genus Chaenea Quennerstedt. Elongate; anterior end drawn 

 out into a narrow truncated 'head'; but without any ring furrow; 



Fig. 272. a, Lacrymaria olor, Xl70 (Roux); b, L. lagenula, X400 

 (Calkins); c, L. coronata, X530 (Calkins); d, Enchelys curvilata, X200 

 (Smith); e, Crobyliira pelagica, X500 (Andr^); f, Microregma auduhoni 

 X500 (Smith); g, Chaenea limicola, X310 (Penard); h, Pithothorax ovatus, 

 X550 (Kahl);i, Trachelophyllum clavatum, XlOO (Stokes). 



'head' spirally or longitudinally furrowed; often with longer ciha 

 directed anteriorly; cytostome terminal, not lateral; cyto pharynx 

 with trichocysts; body striation meridional, or slightly right spiral; 

 macronucleus often distributed; fresh or salt water. 



C. limicola Lauterborn (Fig. 272, g). Anterior half of body broad; 

 posterior end drawn out into a point; contractile; cyto pharynx with 

 trichocysts; many trichocysts in endoplasm; contractile vacuoles 

 in a row; 130-150/i long; stagnant fresh w^ater. 



