ASCARIDil]!. 



81 



terns. The male is comparatively small ; has the tail gracefully 

 coiled upon itself towards the ventral aspect, and is in this situation 

 often fiirnished with two membranous, winged appendages, laterally 



/ 



<2 



Fig. 18. — Two specimens of Ascaris osculata, Rudolphi ; from the stomach of the common seal 

 {Fhoca vUulina) . Male and female. Natural size. — Original. 



disposed, so as to assist in the copulatory act. Sometimes also there 

 are two rows of papiUas or tubercles, and occasionally a sucking 

 disk which is placed immediately in front of the anus (Dujardin). In 



Fig. 19. — Caudal extremity of a maXe Ascaris /-eiewi, Eudolphi ; from the rectum of a Weasel- 

 headed Armadillo (^Dasypus sexcinctus). X 25 diam. — Original. 



the female the tail is usually longer and straight ; the vulva being 

 situated, ventrally, a httle way in advance of the centre of the 

 body. The eggs are either elliptical or globular; several of the 

 species being viviparous (Dujardin). 



M 



