INVERTEBRATE ZOOLOGY. 19 



Class II. Infusoria Protozoa with cell-wall, moving by cilia 



or flagella. 



Order 1. Ciliata Infusoria moving by cilia. 



Sub-order 1. Holotriclia Cilia uniformly covering the body. 



•^ Paramoecium. 

 Sub-order 2. Heierotrkha Cilia in patches and often of different 



lengths. •^Steutor. 



Sub-order 3. Hypotricha Cilia only underneath. Creeping forms. 



Sub-order 4. Peritricha Cilia in a ring around the mouth. 



•^ VorticeUa. Epistylis. 



Order 2. Flagellata Infusoria moving by flagella. 



Sub-order 1. NudoJkujeUaid Simple monads. ifEngkna. 



Sub-order 2. Choanoflagell(it(( . .Collared monads, often colonial. 



if Cndosiga. 



Sub-order 3. CiUoflagellata Mostly marine forms with a silicious exo- 



skeleton. -^ Ceratium. 



Sub-order 4. Cysfojkigelhita .. .Very large marine forms, with reticula- 

 ted endoplasm. if Noctiluca. 



Supplementary Sul)-order . 5. Volvociiia Spherical colonies, showing 



division of labor. Perhaps similar to 

 Blastaea. if Volvox. 



Order 3. Suctoria With knobbed tentacular processes that 



act as suckers. 



SUPPLEMENTARY CLASSES. 



Class. Gregarintda Worm-like imicellular parasites, with 



contractile layer. Reproduction by 

 means of pseudonavicella-cyst. 

 if Monocystis. 



Class. ScHizoMYCETES (Bacteria) . . . The most mintite of organisms. The 



cause of ferment, decomposition and dis- 

 ease, now generally placed among the 

 plants. The chief forms are the ball 

 form, Mkrococcus, the sticks and threads, 

 Bacterium and Bacillus, and the spiral 

 form, SpiHlImn. 



