28 



PHYSIOLOGY OF THE INVERTEBRATA. 



vacuole, where the food is retained until digested. There is 

 no contractile vacuole. 



The Infusoria Untaculifera, or Acinetce (Fig. 3, b), are 

 organisms that move about very little — some of them being 





Gv 



Fig. 3.— Types of Infusoria. 



Representing the Flagellata, the Tentaculifera, and the Ciliata. 



A = Noctiluca. B = Acineta. C i = Vorticella. C 2 and 3 = Paramoecium. 



Gv = Gastric vacuole. F = Flagellum. i = Tentacles, n = Nucleus. 



V = Contractile vacuole, m = Mouth. = (Esophagus. 



fixed to a pedicle their whole life. These organisms possess 

 tentacula, or suckers, and are entirely different from the 

 radiating pseudopodia of the Badiolaria. Each tentaculum 

 is a tube (containing a granular fluid) which terminates 



