92 CH. WARDELL STILES AND ALBERT HASSALL 



gone to press. Unfortunately the characters of the form are not 

 given in ail détail, but the name is cited here during the proof 

 reading of this article, in order to hâve the generic names as com- 

 plète as possible. 



Phasciola see Fasciola. 



Planaria see Fasciola. 



Pleorchis Railliet, 1896. — Tji^e Distomum polyorchis Stossich, 

 1888. 



(1888), Distomum (Polyorchis) Stossich [nec (1) Agassiz, 1862], 

 Programma del Ginnasio comm. sup., Trieste, anno XXV (1887- 

 1888). Type, Distomum polyorchis Stossich, 1888. 



1892, Polyorchis (Stossich, 1888) as genus, Stossich, Programma 

 civica Scuola Reale superiore, p. 4 of reprint. 



1896, Pleorchis Railliet, Recueil de méd. vét., (8), III. n'^ 5, 

 (march 15), p. 160. Polyorchis Stossich renamed. 



We believe that this group, based upon Distomum polyorchis, is 

 valid, although as at présent used it includes rather a heterogeneous 

 assemblage of species . 



Podocotyle (Dujardin, 1845). — Type, Distoma angulatum Dujar- 

 din, 1845. 



? 1809, Schisturus Rudolphi [nec (2) Oken, 1825j, Entozoorum 

 hist. nat., II, I, pp. 8, 31. Type, Schisturus paradoxus Rudolphi, 1809 

 ( ^= ? Distoma nigroflavum Rudolphi, 1819). 



1845, Distoma (Podocotyle) Dujardin, Histoire nat. des helminthes, 

 pp. 382, 388, 401. 



1892, Podocotyle (Dujardin, 1845) as genus, Stossich, Pro- 

 gramma civica Scuola Reale superiore, p. 4 of reprint. 



Podocotyle was first proposed as a subgenus by Dujardin who 

 included in it Dis l orna perlatum Nordmann {=Fasciola tincae Modeer, 

 1890), D. angulatum Dujardin, 1845, D. gibbosum Rudolphi, and 

 D. furcatum Bremser. It was accepted as a subgenus by Stossich 

 (1886), Braun, and Railliet (1893). Stossich in 1892 raised it to 

 generic rank. 



Dujardin evidently examined both D. perlatum and D. angulatum, 

 but it is not clear that he studied D. gibbosum or D. furcatum, and 

 it is therefore évident that one of the first species should be chosen 



(1) Polyorcfiis'^AgaiSsiz,'A8GÈ, Coelenterate. 



(2) Schisturus Oken, 1825, Crustacean. 



