24 



THE ROUNDWORMS OP DOMESTIC SWIXE. 



ture of the lateral wings, illustrating the description with drawings, 

 which were of great value to the present writer in verifying his iden- 

 tification. In common with Railliet and Henry (191 Ib) the present 

 writer was unable to find the pair of papillae depicted by Von Drasche 

 (1884a, fig. 24 of this article) close to the edge of the anus. Ciurea 

 (1912), however, depicts a pair of papillae immediately posterior of 

 the anus, which he states are not easily seen. At the extreme tip of 

 the tail Von Drasche (fig. 24) shows three pairs of minute apparently 

 sessile papillae. In reality there are four pairs of minute stalked 

 papillae at this point. These appeared very clearly with a high 



^lo mm, 



FIG. 20.Physocephalus sexalatus. Bursa of male, viewed from left side, cl., cloaca; I. b. w., left bnrsal 

 wing; 1. sp., long spicule; po. p., postanal papillae; pr. p., preanal papillae; r. 6. w., right bnrsal wing; 

 sft. s.sp., sheath of short spicule; s.sp., short spicule; v. w., ventral wing of short spicule. X 100. (Orig- 

 inal.) 



power in mounts presenting a somewhat lateral view (fig. 20). The 

 structure at the tip of the tail with its rows of minute papillae is not 

 unlike that depicted by Ciurea (1911) for the bursa of Arduenna 

 strongylina. As already stated, however, no such structure was seen 

 by the present writer on the bursa of this species. In a cross section 

 of P. sexalatus (fig. 25) Von Drasche shows that the projecting cuticle 

 forming the lateral wings has corresponding depressions inward. 



Stossich's (1897b) description of P. sexalatus follows that of Molin 

 and Von Drasche. Piana (1897e), in an article on Simondsia para- 

 doxa, mentions finding two other species of nematodes in the same 

 bottle containing the specimens of Simondsia. He identified these 

 as being Spiroptera strongylina and PhysocepJialus sexalatus. These 

 .specimens were from an Italian pig. 



