82 ENTOZOA. 



As tlie structure and development of Ascaris lumbricoides and 

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

 here unnecessary to select any particular type for illustration. 



Fig. 20.— Caudal extremity of a male Ascaris vesicularis, Froelich ; from one of the mtestiual 

 ececa of a Bing-nected Pheasant {Phasiaims torquat-us). X 30 diam. — Original. 



Genera. — Ascaris, Linneus ; = Lumbrims, "Werner ; EeteraJds, 

 Dujardin ; Heligmus, Dujardin ; Peritrachelius, Diesing ; Acantho- 

 cheihis, Molin ; Grossophorus, Hempricb. and Ehrenberg ; ? Atractis, 

 Dujardin ; Ozolairmis, Dujardin. 



