PLATE V 



CiLIATE INFUSORIA ; VOET1CELLA AND SIMILAR FORMS 



FIGURE 1. Vorticella, a narrowly pyriform species, with slender contractile stalk, 

 which can extend to five or six times the length of the body. The whole body 

 was covered by papillae, as in V. monilata Tatem, but the shape of the body is 

 different. 



FIGURE 2. Vorticella, a species of conical form, widest at the mouth, and with a con- 

 striction separating a basal portion, one-third of the total length. There is only 

 a short broad stalk, but it may have been broken off. 



FIGURE 3. Vorticella, mouth not expanded. 



FIGURK 4. Vorticellid, narrowly oblong ; free-swimming example, with posterior 

 ring of cilia and no stalk. 



FIGURE 5. Vorticella, long narrowly oval species, with narrow mouth. 

 FIGURE 6. Vorticellids, two contracted individuals on one stalk. 



FIGURE 7. An animal of doubtful position, resembling the Vorticellids in possessing 

 only a circlet of cilia round the mouth. 



FIGURE 8. Vorticellid, another free-swimming example. 



