4 8 



SYSTEMATIC ZOOLOGY 



' 1 



ABC D 



Fig. 30. Various Ciliata. A, Prorodon teres, one of the Holotricha; B, Climacostomum 



A the Heterotficha ; C, Pleurotricha.gr andis, one of the Hypotricha; D, Vor- 



ticella umbellaria, one of the Peritricha. z, adoral zone of cilia. (After Biilschli, from 



Calkins' Protozoa.) 



Fir,. 31. Epistylis umbellaria, a colony of Peritricha; conjugation. At, macrogamete; 

 in, microgamete. (After Greeft", from Calkins' Proto. 



