228 PARASITES OF THE DOMESTIC ANIjVIALS 



by cuticular ridges in the form of rings or spirals. Spicules unequal, 

 the longer several times the length of the shorter. Four pairs of preanal 

 papillae. Eggs containmg embiyos when oviposited. 



Subfamily Arduenninse, Railhet and Henry, 1911. 

 Type-genus Arduenna, Railhet and Henry, 1911. 



