THE TREMATODE PARASITES OF FISHES. 469 



marine fishes. The most interesting of these have already been described 

 in a previous paper (Nicoll, 1913a). 



At the end of this report a list is given of the fishes examined at 

 Plymouth, with the trematode parasites which were obtained from 

 them. 



I have to thank Dr. E. J. Allen, Director of the Plymouth Marine 

 Laboratory and his assistant, Mr. A. J. Smith, for their unfailing courtesy 

 and help. 



LIST OF SPECIES DEALT WITH IN THIS REPORT. 



DIGENEA. 

 DISTOMATA PROSOSTOMATA. 



Family ALLOCREADIIDAE. 



Sub-Family Allocreadiinae. 

 Genus Podocotyle (Dujardin). 



1. P. atomon (Rud.). 



2. P. reflexa (Crepl). 



3. P. syngfiathi Nicoll. 



4. P. atherinae sp. inq. 



Genus Lebouria Nicoll. 



5. L. varia Nicoll. 



6. L. alacris (Looss). 



Genus Peracreadium Nicoll. 



7. P. genu (Olsson). 



8. P. commune (Olsson). 



Genus Cainocreadium Nicoll, 



9. C. Idbracis (Dujardin). 



Genus Helicometra Odhner. 



10. H. jmlcliella (Rud.). 



Sub-Family Stephanochasminae. 

 Genus Stephanochasmus Looss, 



11. S. fristis (Deslongch). 



12. S. caducus Looss, var. lusci. 



13. S. cesticillus (Molin). 



