510 



PROTOZOOLOGY 



#* 'iSiu^HMB' '^ I'v'at"'- 





Fig. 234. a, Lacrymaria olor, X170 (Roux); b, L. lagenula, X400 

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

 (Smith); e, Crobylura pelagica, X500 (Andr6); f, Microregma auduhoni 

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

 ovatus, X550 (Kahl); i, Tracheloj)hxjllum davatum, XlOO (Stokes). 



with trichocysts; body striation meridional, or slightly right 

 spiral; macroniicleus often distributed; fresh or salt water. 



C. limicola Lauterborn (Fig. 234, 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 chain form; 130-150;u long; stagnant fresh 

 water. 



Genus Pithothorax Kahl, Slender, barrel-shaped; with firm 

 pellicle; a fairly long caudal bristle; contractile vacuole in pos- 

 terior half; ciliation coarse and not over entire body surface; 

 resembles somewhat Coleps; fresh water. 



P. ovatus K. (Fig. 234, h). Caudal bristle breaks off easily; body 

 30/i long; fresh water among decaying vegetation. 



