EDMONDSON — PROTOZOA OF IOWA. 57 



Stichotricha Pert5^ 



Urolephis Ehr. 



Plciirotricha Stein. 



Gastrostyla Eiig. 



Oxytricha Khr. 



Histrio Sterki. 



Stylonychia Ehr. 



'■^Holosiic/m Wrzes. 



Differing from Oxytric/ia in possessing two uninterrupted rows 

 of ventral setae. 



'^Urosovia Kowal. 



Resembling Oxyfrii/ia, but with eight ventral setae and with a 

 tail-like projection. 



EUPLOTID.-Ii. 



Oval, dorsal surface convex. Anal styles usually well devel- 

 oped but those of other series often reduced in number. Mar- 

 ginal series seldom present. 



Euplotes Ehr. 



Aspidisca Ehr. 



Familiks and Genera of Peritricha. 



Note. — Practically all fresh water forms of this order may be included within one 

 family. 



Vorticellid.e. 



Bodies frequently bell-shaped. Front border l)earing a spirally 

 wound wreath of strong cilia; a posterior circle of cilia some- 

 times developed; otherwise the bod}- is free from cilia. Animals 

 attached or free-swimming, often forming colonies and inhabiting 

 loricse. 



Gerda C. & E- 



Scypludia Duj. 



\ 'orticcUa Einn. 



Carc/iesiiiui P^hr. 



Epis/y/is P^hr. 



/ 'aoi)iico/a Eamarck. 



Coi/mniia VMw 



^Zoot/uDiniiioii Ehr. 



[Proc. D. a. S., Vol. XI.l 8 [May 22, 1906.] 



