EDMONDSON — PROTOZOA OF IOWA. 53 



the entire body, the organism dividing into four, then into eight 

 small zooids, which break through the lorica and begin an inde- 

 pendent existence. As a result of the rapid reproduction myri- 

 ads of individuals may be developed in a short time. One or two 

 small contractile vesicles may be observed near the base of the 

 long flagella, also a brilliant red eye-spot. A centrally located 

 nucleus is rendered visible by reagents. 



On one occasion longitudinal division was observed to take 

 place. The species has been found in this state only in the two 

 localities named above. Habitat, pond water among decaying 

 vegetation, or damp moss from the base of trees. 



TABLE OF CLASSIFICATION. 



Class, INFUSORIA. 



Protozoa with cilia during embryonic and adult life or embry- 

 onic only. 



Sub-class, CILIATA. 



With cilia during entire existence. 



vSub-class, SUCTORIA. 



With cilia during embryonic life only, with suctorial or pierc- 

 ing tentacles during adult life. 



Orders of CILIATA. 

 HOLOTRICHA. 



Cilia usually covering the entire body, sometimes slightly 

 longer about the oral aperture. Trichocysts often present. 



HETEROTRICHA. 



Body entirely ciliate, cilia of the oral region longer than those 

 of the general surface and often fused together. 



HYPOTRICHA. 



Usually flattened with cilia confined to the ventral surface. 



PERITRICHA. 



Cilia reduced to one or two wreaths or circles. 



Note. — In some classifications Suctoria is considered as an order, here, however, being 

 used as a sub-class, no order names are given. 



