DE. T. S. COBBOLD S SYNOPSIS OF THE DISTOMID^. 



Baird's admirable ' Catalogue of Entozoa contained in the Collec- 

 tion of the British Museum,' Dr. Bellingham's " Catalogue of 

 Irish Entozoa," in the 13th volume of the 'Annals of Natural 

 History,' and Prof. Owen's classic article " Entozoa," published 

 twenty years since in the 2nd volume of Dr. Todd's ' Cyclopaedia 

 of Anatomy and Physiology.' 



PEIMAET DIVISION OE HELMINTHS. 



r Subclassis I. C Ordo I. Cestoidea. 

 Classis. Sterelmintha. 



Ordo II. Trematoda. 



Entozoa 



Ordo III. Acanthocephala. 

 Ordo IV. Nematoidea. 



Subclassis II. 

 I Ccelehnintlia. 



The members of the second order, or Trematoda, are divided by 

 Van Beneden into two natural groups : the digenetic section, or 

 those species which have a double mode of propagation, represented 

 by the DistomidcB proper ; and the mouogenetic section (aU being 

 oviparous except Gyrodactylus elegans), embracing the Tristomidae 

 and Polystomidce. 



It is now proposed to revise only the first of these three 

 families, and in doing so to adhere to C. M. Diesing's authority, 

 except under circumstances where his arrangements may be reason- 

 ably modified, contra-indicated, or even superseded. 



Fasciola, Linnaeus. 

 Campula, Cobbold. 

 Distoma, Zeder. 

 Bilharzia, Cobbold. 

 KolUTceria, Cobbold. 

 Crossodera, Dujardin. 

 Eehinostoma, Dujardin. 

 Gasterostoma, Von Siebold. 

 Wedlia, Cobbold. 

 <( Monostoma, Zeder. 



Nematobothr mm, Y din Beneden. 

 Codonocephalus, Diesing. 

 Eustemma, Diesing. 

 Holostomuvi, Nitzsch. 

 Hemistoma, Diesing. 

 Diplostomum, Nordmann. 

 IRliopalopliorus, Diesing. 

 AmpMstoma, Zeder. 

 ^AmpJiiptyelies, Grrube et Wagener. 



DISTOMID^. 



