AMCEBA PROTEUS. 3 



Order 2. Sarcosporidiida. 



The initial stage of the life-cycle occurs in the 

 muscle-cells of vertebrates. (Sarcocystis.) 

 CLASS 4. Infusoria. 



With motile organs in the form of cilia during all 

 or part of the life-cycle. Nucleus dimorphic 

 (macronucleus and micronucleus) . Reproduction 

 is by simple transverse division or by budding. 

 Subclass. 1 Ciliata. 



With cilia throughout the life-cycle. 



Order 1. Holotrichida. 



The cilia are of approximately equal length and 

 thickness and equally distributed over the body. 

 Trichocysts are present. (Prorodon, Parame- 

 cium.) 



Order 2. Heterotrichida. 



With a uniform covering of cilia, together with 

 an"adoral zone" formed of cilia fused into mem- 

 branelles. (Spirostomum, Stentor, Halteria.) 



Order 3. Hypotrichida. 



The cilia are limited to the ventral surface of a 

 dorso-ventrally flattened body. Cilia often fused 

 into cirri, membranelles, etc. (Oxytricha, Pleuro- 

 tricha, Euplotes, Peritromus.) 



Order 4. Peritrichida. 



More of less bell-shaped in form. Cilia usually 

 reduced to those constituting the adoral zone. 

 (Vorticella, Zoothamnium, Lichnophora.) 

 Subclass 2. Suctoria. 



Usually possessing cilia only during the embry- 

 onic stages of the life-cycle. Tentacles adapted 

 for piercing and sucking are present. (Podo- 

 phrya, Ephelota, Acineta.) 



SARCODINA. 



AMOEBA PROTEUS. 



Amoebae are usually easily discernible under the low power of 

 the microscope as irregular, semi-transparent, granular bodies. 

 Find a specimen in the material provided, which is known to con- 

 tain amoebae, and determine the following points : 



1. With the high power observe the peculiar method of loco- 



