lo6 



SYSTEMATIC ZOOLOGY FOR TEACHEES. 



rally conclude that this is the anterior or head end. The posterior end is 

 bsnt a little one side leaving the slight protuberance, seen at A in Fig. 68, 

 which somewhat resembles the heel of a slipper. 



Locomotion. The movements of the slipper infusoria are quite rapid, 

 and are accomplished by cilia which completely surround the animal and 

 which are a little larger at the posterior end than elsewhere, forming a kind 

 of tail. 



Structure. Paramoecium will be found to be of a similar, general 

 structure as ampeba, being composed of protoplasm which is divided rather 

 clearly into the enveloping ectoplasm and the internal entoplasm. 



Fig. 68. 



A, Slipper infusoria. B, bell ; C. Bell infusoria dividing ;D, Single fe male bell penetrated by a male 

 bell, 13; V, contracting vesicle; N, nucleus; V O, vestibule; O, oesophagus. 



Circulating System. Circulation is accomplished by two circulating 

 vesicles which, when contracted, show radiating lines, which are possibly oi 

 a tubular structure. 



Digestion. At one point, near the middle of the body, will be found 

 an opening or cavity, known as the vestibule. See Fig. 68, \ o. Around this 



