Page 



Suborder Discocotylinea 



Family Discocotylidae 



Family Anthocotylidae 



Family Plectanocotrylidae 



Family Diclidophoridae 



Family Microcotylidae 



Family Protomicrocotylidae 



Family Gastrocotylidae 



CHAPTER IV, Phylogenetic Interrelations of Families of 



Monogenetic Trematodes 538 



CHAPTER V, About Certain General Peculiarities of Phylogenetic 



Development of Monogenetic Trematodes 552 



CHAPTER VI. Position of Monogenetic Trematodes in the System 



of Flat Worms 563 



CONCLUSION 573 



LITERATURE CITED 577 



ALPHABETICAL INDEX OF NAMES OF MONOGENETIC 



TREMATODES 613 



ALPHABETICAL INDEX OF NAMES OF HOSTS OF 



MONOGENETIC TREMATODES 622 



XIII 



