CONTENTS xi 



Tribe 3 Hypostomata 728 



34 Suborder 3 Trichostomata 737 



35 Suborder 4 Hymenostomata 758 



36 Suborder 5 Thigmotricha 774 



37 Suborder 6 Apostomea 789 



38 Order 2 Spirotricha 796 



Suborder 1 Heterotricha 796 



39 Suborder 2 Oligotricha 814 



40 Suborder 3 Ctenostomata 829 



41 Suborder 4 Hypotricha 832 



42 Order 3 Chonotricha 847 



43 Order 4 Peritricha 850 



44 Class Suctoria 863 



45 Collection, cultivation, and observation of Protozoa 879 



Author index 905 



Subject index 919 



