NOTES ON PARASITES 93 



as type. As Stossich eliminated D. perlatum, which he placed in 

 Echinostoma, we propose to make D. angidatum the type of the 

 genus, and to let the fate of Podocotyle be settled by the fate of this 

 species. 



Should Distoma nigroflavumproYe beyond question to be identical 

 with Schisturus paradoxus, as several authors believe, then Schis- 

 turus would take precedence over Podocotyle. 



Polyorchis see Pleorchis. 



Rhopalias Stiles and Hassall(I), 1898, newgenericname. — Type 

 Distoma coronatum Rudolphi 1819. 



1850, Rhopalophorus Diesing [nec (2) Ropalophorus Westwood, 

 1840; nec Rhopalophora Serv., 1834], Systema helminthum, I, p. 400. 

 Species, Distoma coronatum Rudolphi, 1819, and Rhopalophorus 

 horridus Diesing, 1850. 



We hère propose to substitute the new generic name Rhopalias in 

 place of Rhopalophorus Diesing, because of the name Ropalophorus 

 Westwood which ditïers from Diesing's name only by the absence 

 of the aspirate; thèse two names practically come within the same 

 class of names as sihestris, sylvestris, etc. 



We designate Distoma coronatum Rudolphi, 1819, as type of this 

 genus. Rhopalophorus has been accepted as a valid genus by 

 Diesing (1850),Cobbold(1860),Rraun(Fermes),Monticelli (1892, 1893), 

 and Railliet (1893). The genus appears to us to be valid. 



Rhopalophorus see Rhopalias. 



Schistosoma Weinland, 1858. — Type, Distoma hsematobium 

 Bilharz, 1852. 



1858, Schistosoma Weinland [nec (3) Brady, 1877], Human Ces- 

 toides. AnEssay, etc., p. 87. — Distoma hsematobium Bilharz, 1852. 

 (Issued prior to Sept. 30, 1858). 



1858, Gynœcophorus DiESiisiG, Sitzungsber. k. Akad. Wissensch. 

 Wein., XXXII, p. 356. — Type, Distoma hsematobium Bilharz, 1852. 

 (Issued subséquent to Oct. 21, 1858). 



1859, Bilharzia Cobbold, Trans. Linnean Soc. London, XXII, 

 p. 364. — Type, Distoma hsematobium Bilharz, 1852. 



(1) Nec Rhopalia Macquart, 1838, Dipteron. 



(2) Ropalophorus Westwood, 1840, Hymenopteron ; Rhopalophora Serv., 1834, 

 Coleopteron. 



(3) Schistosomus G. St-Hilaire, 1837, in teraloloyy; Schistosoma Brady, 1877, 

 Aruchnoid; Schizosoma Brady, 1877, Crustacean. 



