134 PHYLUM PROTOZOA — THE SIMPLEST ANIMALS 



and Cystoflagellata, in both of which there are two flagella, differ- 

 ently placed in the two cases. In the first are included Peridinium and 



Fig. 62. — The trumpet -shaped cihated Infusorian, 

 Stentor. — After Stein. 



A^., Beaded iiiacronucleus ; «., divided niicronucleus ; 

 C.V., contractile vacuole ; AD., large adoral cilia, spirally 

 arranged ; C7., small cilia all over ; P., a particle being 

 wafted into the mouth, which is near the centre of the 

 whirlpool. Numerous food vacuoles are seen in the general 

 cytoplasm. 



Cerattum ; in the latter, the large phosphorescent Noctiluca. 

 form an important part of the plankton of lakes and sea. 



They 



