82 BNTOZOA. 



As the structure and development of Ascaris himbricoides and 

 A. mystax will be described in the second part of this work, it is 

 here unnecessary to select any particular type for illustration. 



r\^ 



Fia. 20. — Caudal exfremiiy of a male Ascaris vesicularis, Froelich ; from one of the intestinal 

 coeca of a King-necked Pheasant [Fkasianus torquatus). X 30 diam. — Original. 



Genera. — Ascaris^ Linneus ; = Lumbricus, Werner ; Heteralds, 

 Dujardin ; Heligmus, Dujardin ; Peritrachelms, Diesing ; Acantho- 

 cheilus, Molin ; Grosso])horus, Hemprich and Ehrenberg ; ? Atractis, 

 Dujardin ; Ozolaim^us, Dujardin. 



i 



