and partially to Calceostomatidae, is abolished. The remaining sub- 

 families of Monocotylidae remain without changes. The family 

 Calceostomatidae is supplemented by the new family Dionchinae which 

 consists of the genera attributed by Monticelli to Anisocotylinae. It is 

 interesting that Acanthocotylinae are separated from the family 

 Tristomidae as a supplement to the subfamilies of Gyrodactyloidea. 

 At the same time, the authors include the genus Lophocotyle earlier 

 ascribed to Anisocotylinae into the same subfamily. Finally, a new 

 subfamily Protomicrocotylinae with one new genus, Protomicrocotyle 

 (on the basis of the species described by MacCallum),is established as 

 a supplement to Gyrodactyloidea. 



Without stopping on smaller works which only have partial 

 significance we should only note two more works before the exposition 

 of contemporary systems. 



Thus, in the large r^ume''of flatworms Poche (Poche, 1925) p. 337 

 re-examines the system of monogenetic trematodes and his re -exami- 

 nation is not the result of a new independent study of the material but a 

 purely literary work. Nevertheless, in his work there are a number of 

 positive traits, and the system expounded by him deserves to be noted. 

 This system has the following form: 



Order Monogenea Carus 

 1. Tribe Monopisthocotylea Odhner 



1. Subfamily Tristomatides nom. nov. 



1. Fannily Tristomatidae Gambel 



2. Family Udonellidae Taschenberg. 



2. Subfamily Gyrodactylides nom. nov. (Gyrodactyloidea Johnston and 



Tiegs. ) 



3. Family Protogyrodactylidae Johnston and Teigs 



4. Family Gyrodactylidae Cobbold 



5. Family Monocotylidae Taschenberg 



6. Family Calceostomatidae nom. nov . 



2. Tribe Polyopisthocotylea Odhner 



7. Family Polystomatidae Gamble. 



8. Family Sphyranuridae nom. nov. (Dicotylidae Monticelli) 



9. Family Octocotylidae Monticelli 



10. Family Plectanocotylidae nom . nov . (Hexacotylidae 



Monticelli) 



396 



