STRONGYLID^. 83 



CHAPTER VI. 



NEMATODA. 



Strongylidse — Grenera — The Sclerostoma Syngamus as a type, witla a particular account 

 of the gape disease whicli it oocasions^Struoture and development — Eemedial 

 methods — The genus Prostheeosacter — Organization of P. eonvolutus — Mode of 

 reproduction — OucuUanidae — Genera. 



StrongylidoB. — The varied members of this family present one or 

 two characters in common, whilst several others prevail almost 

 throughout the entire group. In all the body is round, and 

 sometimes very much elongated and filiform. The mouth is either 

 rotmd, oval, or triangular, frequently very large, naked or armed 

 with a homy pharyngeal armature ; the latter forming either a 



I 

 I / 

 1 



Fia. 21. — Cephalic extremity of Eustrongyliis papillosus, Dieaing ; from the oral oaTity of a crane 

 {&rus antigone). Magnified. — Original. 



single globular piece, or made up of several distinct pieces. Tail 

 of the male furnished with a bursa, usually emitting two spicules ; 

 in some the place of the bursa is occupied by two divergent mem- 

 branous lobes. 



Genera. — Strongylus, MiiUer ; ? TJncinaria, FroeHch ; Eustron- 

 gyhis, Diesing ; = Diocotophyme, OoUet-Meyret ; Sclerostoma, 

 Rudolphi ; = Anchylostoma, Dubini ; = Syngamus, Von Siebold ; 



