40 j>n. T. s. cobbold's srxopsis or the distomid^. 



In statu larvae. 



Cercariajlava, La Valette. 



E. ephemera, Siebold, Steenstrup, Dujardiu, Moulinie, Filippi, Pageu- 



stecher. 

 Glenocercaria flava, Diesing, Revis. der Cere. p. 8. 

 Histrionella ephemera, Siebold. 

 Hub. Infests various aquatic birds. Found by Siebold in Mergus Ser- 



rator, and by Mehlis in Anas fuliginosa ; it has also been noticed in 



A.fusca, A. moUissima, A. Marila, and Mergus albellus. 

 The larvae have been found by Siebold, Pagenstecher, and La Valette in 



Planorbis corneus. 



3. MONOSTOMA ATTENUATUM, Rudolphi. 



M. attenuatum., Rudolphi, Dujardin, Bellingham, Creplin, Diesing. 



Hab. Found by Crephn in Anas Anser, A.ferina, A. Marila ; by Brauu 

 in A. clypeata; by Mehlis in A.fusca, A. glacialis, A. Clangula, A. 

 Fuligula, A. music a, A. Tadorna; by Bellingham in the latter, in 

 A. Penelope, and A. alhifrons ; by Mehlis also in Mergus Merganser 

 and M. Serrator; by Rudolphi in Scolopax Gallinago. 



4. MoNOSTOMA ALVEATUM, MchUs. 



M. alveatum, Mehlis (non descriptum) ; Creplin, Diesing, Revis. p. 331 



(spec, inquirendse). 

 Hab. Found by Mehlis and Creplin in Anas fusca ; by Creplin and 



Laurer in A. Marila ; by Schilling in A. glacialis, A. moUissima, A. 



musica, and A. Penelope. 



5. MoNOSTOMA PETASATUM, Deslougchamps. 



M. petasatum, Deslongchamps, Diesing (species iuquirendae). 

 Hab. Found by Deslongchamps in the intestinal cfeca of Hcematopus 

 Ostralegus. 



6. MoNOSTOMA LANCEOLATUM, Wcdl. 



M. lanceolatum, Wedl, Anat. Beobacht. iiber Tremat. p. 13 ; Diesing, 



Revis. p. 21. 

 Hab. Found by Wedl in the abdominal cavity of Himantopus melanopterus. 



7. MoNOSTOMA Cymbium, Dicsing. 

 M. Cymbium, Diesing. 



Hab. Found by Natterer in Brazil in the oesophagus of Himantopus 

 Wilsonii. 



8. MoNOSTOMA EXPANSUM, Creplin. 

 M. expansum, Creplin, Dujardin, Diesing. 



Hab. Found by Creplin in the small intestines of Falco haliceetus. 



9. MoNOSTOMA PRiSMATicuM, Zeder. 



M. prismaticum, Zeder, Rudolphi, Dujardin. 



Hab. Found by Zeder in the intestines of Corvus frugilegus. 



10. MoNOSTOMA VENTRICOSUM, Rudolphi. 



M. i^entricosum, Rudolj)hi, Dujardin, Diesing. 



