THE INFUSORIA 



415 



FIG. 



Vorticella microstoma, Ehrb. 

 On the left a female with two 

 males (c.d) attached to it. 

 Only one (d) is in the act of 

 conjugation. a, meganu- 

 cleus; b, contractile vacuole ; 

 e, ciliated disc ; /, vestibule. 

 On the right an individual 

 with the stalk contracted 

 and the body enclosed in a 

 cyst. 



Fio. 78. 



,Cyclops with several col- 

 onies of Epistylis anastatica 

 attached to the antennae and 

 somites. (After Saville Kent.) 

 x 10. 



Fio. 80. 



Opercularia stenostoma, Stein. 

 Observe the undulating mem- 

 brane of the oral vestibule and the 

 oblique ciliate disc, x 200. 



FIG. 77. 



Vorticella nebulifera, Ehrb. A social group showing at 

 a and b successive stages of fission, and at c, conjugation. 

 (After Saville Kent.) 



FIG. 



Epistylis anastatica, Linn. Colonial stocks attached 

 to the limbs of Cyclops. (After Saville Kent.) x 100. 



