H CLASSIFICATION OF TREMATODA 73 



used. Monticelli 1 has proposed the main divisions of a new classi- 

 fication, which has been also adopted by Braun, and is based 

 on the nature of the suckers. These divisions are indicated 

 below in brackets. 



A. Monogenea v. Ben. (Heterocotylea Mont.). 



1. Fam. Temnocephalidae Hasw. 



Gen. Temnocephala Hasw. 



2. Fam. Tristomatidae Tschbg. 

 Sub-Fam. 1. Tristomatinae Mont. 



Gen. Tristomum, Nitzschia, Epibdella, Trochopus, Acantho- 

 cotyle, Phyllonella, Placunella, Encotylabe. 

 Snb-Fam. 2. Monocotylinae Tschbg. 



Gen. Pseudocotyle, Calicotyle, Monocotyle. 

 Sub-Fam. 3. Udonellinae v. Ben.-Hesse. 



Gen. Udonella, Echinella, Pteronella. 



3. Fam. Polystomatidae Tschbg. 

 Sub-Fam. 4. Octocotylinae v. Ben.-Hesse. 



Gen. Octobothrium, Pleurocotyle, Diplozoon, Anthocotyle, 

 Vallisnia, Phyllocotyle, Hexacotyle, Platycotyle, Plec- 

 tanocotyle, Diclidophora. 

 Sub-Fam. 5. Polystomatinae v. Ben. 



Gen. Polystomum, Onchocotyle, Erpocotyle, Diplobothrium. 

 Sphyranura. 

 Sub-Fam. 6. Microcotylinae Tschbg. 



Gen. Microcotyle, Gastrocotyle, Axine, Pseudaxine. 



4. Fam. Gyrodactylidae v. Ben. 

 Sub-Fam. 7. Gyrodactylinae Par. et Per. 



Gen. Gyrodadylus, Dactylogyrus, Tetraonchus, Diplectanmu. 

 Sub-Fam. 8. Calceostominae Par. et Per. 

 Gen. Calceostomum, Anoplodiscus. 



5. Fam. Aspidobothridae Burm. ( = Aspidocotylea Mont.). 



Gen. Aspidogaster, Platyaspis, Cottjlogaster, Macraspis. 



B. Digenea v. Ben. (Malacocotylea Mont). 



6. Fam. Holostomatidae Brandes ( = Metastatica Leuckart). 

 Gen. Liplostomum, Polycotyle, Hemistomum, Holostomum. 



7. Fam. Amphistomatidae Mont. 

 Gen. Amphistomum, Diplodiscus, Gastrodiscus, Homal 



Gastrothylax, Aspidocotyle. 



8. Fam. Distomatidae Mont. 

 Gen. Distomum (and sub-genera), Rhopalophorus, Kik'llikei*ia, 



Bilharzia. 



9. Fam. Gasterostomatidae Braun. 

 Gen. Gasterostomum. 



10. Fam. Didymozoontidae Mont. 

 Gen. Didymozoon, Nematobothrium. 



11. Fam. Monostomatidae Mont. 

 Gen. Mo?iostomum, Notocotyle, Ogmogaster, Opisthotrema. 



1 Fcstschr.f. Leuckart , 1892, p. 134. 



