42 THE ROUNDWORMS OF DOMESTIC SWINE. 



Family Filariidte. Nematoda: Body long, filiform. Mouth surrounded with 

 papillae, or provided with two lips. Esophagus slender, without 

 posterior bulb. Males with two unequal spicules (sometimes with 

 a single spicule). Females with two ovaries. Vulva usually 

 anterior of the middle of the body. Development often requires 

 an intermediate host. 



Genus Filaria. Filariidae: Body long and slender, of nearly uniform 

 diameter throughout; males considerably smaller than the females, 

 with the tail hooked or curved in a spiral, sometimes furnished 

 with lateral wings. Usually there are four preanal and a variable 

 number of postanal papillae. Spicules usually very different in 

 shape and dimensions. Vulva more or less near the mouth. 



Filaria bauchei. ' 



Genus Setaria. Filariidae: Head armed with a projecting peribuccal 

 circle, deeply notched laterally, somewhat less indented dorso-ven- 

 trally, giving the impression of two teeth when seen laterally and 

 of four teeth when seen at an angle. Tail of both sexes provided 

 with two special appendices Setaria bernardi. 



Genus Gongylonema. Filariidae: Body filiform, slightly attenuated 

 at either end. Anterior portion of body covered with numerous 

 tubercles or shields formed by differentiation of the cuticle. In 

 the median lines immediately behind the mouth, two semilunar 

 depressions, one dorsal, the other ventral. Tail of male curved 

 ventrally, supplied with two asymmetrical membranous wings. 

 Vulva a short distance anterior of the anus. .Gongylonema scutatum. 3 



Gongylonema pulchrum. 



Subfamily Arduenninae. Filariidse: 3 Mouth with two lateral lips leading 

 into a pharynx marked with cuticular ridges in the form of spirals 

 or rings. Spicules unequal, the longer several times the length of 

 the shorter. Four pairs of preanal papillae. Eggs containing 

 embryos at the moment of ovi position. 



Genus Arduenna. Arduenninae: Mouth leading into a cylindrical 

 pharynx marked by ridges, forming a continuous multiple spiral. 

 Esophagus continuous, nearly one- third of the length of the body. 

 Spicules very long and very unequal. Tail twisted in a single 

 coil. Bursa asymmetrical, supported by five pairs of papillae. 



Arduenna strongylina. 

 Arduenna dentata. 



Genus Physocephalus. Arduenninae: Body furnished anteriorly 

 with six lateral wings arranged in a group of three wings each, on 

 either side. The middle wing of each group is the widest. Pharynx 

 cylindrical, relatively broad and long, marked with a simple spiral 

 ridge on the inside, breaking up into separate rings and resuming 

 the spiral at the posterior end Physocephalus sexalatus. 



Genus Simondsia. 4 Filariidae: Female characterized by a tegumen- 

 tary excrescence in the form of a rosette situated in the posterior 

 part of the body and inclosing a prolongation of the intestine and 

 a hypertrophied uterus Simondsia paradoxa. 



i.This species, described by RailHet and Henry (1911), is provisionally included in the genus Filaria, 

 sensu lato. As only one female was received, the material was insufficient for a more accurate generic 

 diagnosis. 



* Sec footnote 2, p. 39. 

 ^ See footnote, p. 9. 



Railliet and Henry (1911b) include Simondsia In the subfamily Arduenninne, although Piana (1897e) 

 describes the lips as dorso-ventral rather than lateral. In the structure of the esophagus, the number 

 of preanal papillae, and the inequality of the spicules Simondsia conforms to the description of the sub- 

 family Arduenninse. 



