CILTA.TA. 205 



always furnished with long cilia or undulating membranes. Paramcecium 

 Aurclia Fr. Miiller, P. Bursaria Focke, Colpoda cucullus Ehrbg., Glaucoma 

 scintillans Ehrbg. 



2. Sub-order: Heterotricha. Body uniformly covered with fine 

 cilia, which are arranged in longitudinal rows, with a distinct 

 adoral zone of cilia. 



Fam. Bursaridae. The adoral zone of cilia is on the edge usually of the left 

 half of the body. Sursaria truncatella 0. Fr. Mull., Balantidium coli 

 Malmst., parasitic in the colon of man ; Spirostomum ambiguum Ehrbg. 



Fam. Stentoridae. At the anterior end of the body is a peristomial space with 

 a funnel-shaped depression, without any distinct gullet. Stentor polymorplius, 

 O. Fr. Mull., St. ccarulcus Ehrbg. 



3. Sub-order : Hypotricha. Body with sharply defined dorsal and 

 ventral surface. The convex dorsal surface is usually naked, the 

 ventral covered with cilia and beset with styles and processes, mouth 

 on the ventral surface. 



Fam. Oxytrichidae. Body elongated to an oval. On the left half of the 

 ventral surface is a peristomial region, with an adoral zone of cilia. The ventral 

 surface is beset at either edge by a marginal row of cilia, and also with bristles 

 and hooks. Stylonycliia pustulata Ehrbg., with eight anterior styles, five 

 ventral, and five anal cilia. Oxytriclia gilla, O. Fr. Miiller. 



Fam. Chilodontidae. Body usually armoured, with gullet in the form of a 

 fish -basket. Chilodon cucullus Ehrbg. 



4. Sub-order : Peritricha. Infusoria with cylindrical or bell-shaped 

 partially ciliated body. The cilia are placed on an adoral ciliated 

 disc, and frequently on a ring-like zone. 



Fam. Vorticellidae. Peritricha with adoral spiral of cilia, without a shell, 

 attached by a stalk, usually forms colonies. Vorticella microstoma Ehrbg., 

 Epistylis plicatilis Ehrbg., Zootliamnium arluscula Ehrbg., Carchesiwn 

 polypinum Ehrbg. 



Fam. Trichodinidae. Peritricha with adoral spiral of cilia, and circle of cilia 

 as well as an apparatus for attachment at the posterior end. Tricliodinapcdiculus 

 Ehrbg. 



Fam. Halteriidae. Near the adoral spiral of cilia is an equatorial zone of 

 longer cilia. Haltcria volvox Clap. Lachm. 



5. Sub-order : Suctoria. Body usually without cilia, with knobbed 

 tentacle-like processes which serve as sucking tubes. 



Fam. Acinetidae. Acineta mystacina Ehrbg., Podoplirya cyclopum Clap. 

 Lachm., Splicerophrya Clap. Lachm. 



As an appendix to the Protozoa we will now proceed to consider the Schizo- 

 mycetidce, which approach more nearly to the Fungi, and the Grcgarlnidte. 



