MANUAL OF ZOOLOGY 



SECT. 



ments. Noctiluca (Cystoflagellata) (Fig. 16), which is 

 the largest member of the class, being about half a mille- 

 metre in diameter, has two flagella, one of which is modified 



in a remarkable manner. The body of Noctiluca is globu- 

 lar, with a cleft along one side so that it resembles a 

 miniature peach. From this springs a very large and stout 

 flagellum or tentacle, which is marked with a number of 



