10 



THE BOUNDWORMS OF DOMESTIC SWINE. 



Arduenna strongylina (Rudolphi, 1819) Railliet and Henry, 1911. 



1819: Spiroptera strongylina Rudolphi, 1819a, p. 23. 



1819: Spiropteru strongylina Rudolphi, 1819a, p. 237. Misprint for 



Spiroptera. 



1828: Spiroptera strongyliformis De Blainville, 1828a, p. 546. 

 1866: FUaria strongylina (Rudolphi) Schneider, 1866a, p. 101. 



/fomm. 



FIG. 1. Arduenna strongylina. Median view of cephalic end. b. c., buccal capsule; cut., cuticle; <., 

 esophagus; lab. p., labial papillae; ph., pharynx; t. b. c., teeth of the buccal capsule. X 560. (Original.) 



SPECIFIC DIAGNOSIS. Cuticule densely striated transversely, increasing in thickness 

 toward the anterior extremity, which is furnished with two cervical papillae placed 

 asymmetrically, the left being about 190 p and the right 390 fi from the anterior ex- 

 tremity. Beginning at a point 280 fi from the anterior end on the left side, a narrow 

 cuticular wing gradually increasing to a maximum breadth of 35 p. extends to a point 

 about 2 mm. from the posterior extremity. Mouth 44 to 45 ft in diameter with two 

 lateral lips each with three lobee, having a small round papilla at the base of each of 

 the lobes. Just below the lips and projecting into the mouth cavity are two chitinous 

 teeth, formed by a prolongation of, the wall <?f. the pharynx (fig. 1). The pharynx, 29 /* 



