PROTOZOA. 5 



Order 3. Oligotrichida. 



With greatly reduced cilia or none at all. 

 Adoral zone of membranelles forming a more or 

 less complete ring around the peristome. 

 (Halteria, Tintinnus.) 



Order 4. Hypotrichida. 



The cilia are limited to the ventral surface of a 

 dorso-ventrally flattened body. Cilia often 

 fused into cirri, membranelles, etc. (Oxy- 

 tricha, Pleurotricha, Euplotes, Stylonychia.) 



Order 5. Peritrichida. 



More or less bell-shaped in form. Cilia usually 

 reduced to those constituting the adoral zone. 

 (Vorticella, Zoothamnium, Lichnophora.) 

 Subclass 2. Acinetaria. 



Usually possessing cilia only during embryonic 

 stages. Tentacles adapted for piercing and 

 sucking are present. (Podophrya, Ephelota, 

 Acineta.) 



Blochmann: Die Mikroscopische Tierwelt des Susswassers. Abt. 1. Pro- 

 tozoa, 1895. 



Biitschli: Protozoa. Bronn's Thierreich, 1889. 



Calkins: Biology of the Protozoa, 1926. 



: Marine Protozoa of Woods Hole. Bui. U. S. Fish. Com., 1901. 



Conn: Fresh Water Protozoa of Connecticut. Bui. State Nat. Hist. 

 Surv., 1905. 



Doflein: Lehrbuch der Protozoenkunde. 4 Auf., 1916. 



Edmondson: Protozoa of Iowa. Davenport Acad. Sci., 1906. 



Hartmann and Kisskalt : Praktikum der Bakteriologie und Protozoologie, 

 1910. 



Jennings: Behavior of the Lower Organisms, 1906. 



: Life and Death, Heredity, and Evolution in Unicellular Organisms, 



1920. 



Kent: Manual of the Infusoria, 1881. 



Lankester: Treatise on Zoology. 1. Protozoa. 



Leidy: Fresh Water Rhizopods of North America, 1879. 



Maupas: Studies on Infusoria, in Arch. Zool. Exp. et Gen., 1883, 1888, 

 and 1889. 



Minchin: Protozoa, 1912. 



Prowazek: Emfiihrung in die Physiologie der EinzeUigen (Protozoen), 



1910. 

 : Taschenbuch der Mikroskopischen Technik der Protistenunter- 



suchung, 1909. 

 Stokes: Contribution Toward a History of the Fresh Water Infusoria of 



the United States. Jour. Trenton Nat. Hist. Soc, 1, 1888. 

 Whipple: Microscopy of Drinking Water, 4th ed., 1927. 

 Woodruff: Observations on the Origin and Sequence of the Protozoan 



Fauna of Hay Infusions. Jour. Exp. Zool., 12, 1912. 



