346 HANDBOOK OF PROTOZOOLOGY 



Pycnothrix monocystoides Schubotz. In the intestine of 

 Procavia capensis of Africa. 



Family 2 Holophryidae Schouteden 



Genus Holophrya Ehrenberg. Body ovate or globose. Cilia- 

 tion uniform. Cytostome simple, without any special ciliary 

 ring around it. Fresh or marine water. 



Holophrya discolor Ehrenberg (Fig. 148, b). Body ovoid to 

 subspherical, about 150 microns long. In still fresh water. 



Genus Balanitozoon Stokes. Oval or rounded triangular in 

 shape. Cilia only on the anterior half. A single nucleus, con- 

 tractile vacuole, and cytopharynx. A long seta at the posterior 

 extremity. Swimming as well as leaping movement. Fresh 

 water. 



Balanitozoon agile Stokes (Fig. 148, c). Body small, about 

 15 microns long. In standing water with Sphagnum. 



Genus Urotricha Claparede and Lachmann. Body oval or 

 ellipsoidal in form; ciliation uniform; one or more posterior 

 setae as long as the body. A small circular cytostome at an- 

 terior end. Contractile vacuole posterior. Fresh water. 



Urotricha /areata Claparede and Lachmann (Fig. 148, d). 

 Length about 24 microns. Holozoic on bacteria. Pond-water 

 and infusion. 



Genus Actinobolus Stein. Body ovate or spherical. Cilia 

 are uniformly short; extensible tentacles among the cilia. Con- 

 tractile vacuole conspicuous; macronucleus a curved band. 



Actinobolus radians Stein. In fresh water among Lemnae. 



Genus Coleps Ehrenberg. Body barrel-shaped and constant; 

 covered with platelets which are variously sculptured. Spinous 

 projections often at the posterior end. The cytostome is sur- 

 rounded by slightly larger cilia. Division stages common. 

 Fresh or salt water. Several species. 



Coleps hirtus (Miiller) (Fig. 148, e). Body 40 to 65 microns 

 long. 20 longitudinal rows of platelets and 3 posterior spines. 



Coleps elongatiis Ehrenberg (Fig. 148,/). Body slender, 40 

 to 55 microns long. 13 rows of platelets; 3 posterior spines. 



Coleps bicuspis Noland (Fig. 148, g). Body about 55 microns 

 long. With two posterior spines and 16 longitudinal rows of 

 platelets. 



