PHYLUM PROTOZOA 



53 



In many forms, such as Vorticella, which is attached by a 

 stalk, the cilia create water currents carrying food to the animal 

 and do not ordinarily produce locomotion. Under such circum- 

 stances dissemination of the species is accomplished during the 



Fig. 33. — Balantidium minutum Fig. 34. — Neuromotor system in 

 Schaudinn. {After Schaudinn). Euplotes karpa, showing system of 



fibrils connecting the cirri. (After 

 Prowazek) . 



reproductive period when individuals break loose from their stalks 

 and for locomotion use cilia which are formed at this time only. 



Class Suctoria 



The Suctoria are characterized by the complete lack of cilia 

 in the adult stage and the presence of tentacles by means of which 



Fig, 35. — Suctoria (after various writers). A, colony of Dendrosoma; B, 

 Rhyncheta; C, Ophryodendron; D, Tokophrya; E, ciliated young of Sphaero- 

 phrya; F, diagram of capitate and styliform tentacles arising from ectoplasm. 

 (From Hertwig's Manual of Zoology by Kingsley, Courtesy of Henry Holt and Co.). 



other organisms are captured and the protoplasm drawn into the 

 body of the suctorian. Cilia occur on the body of the free-swim- 



