1922.] 



H. A. Baylis and R. Daubney : Parasitic Nematodes. 



299 



Then, taking a turn to the right, and dorsally again, it doubles back upon itself. On 

 reaching a point just behind the level of the vulva the character of the walls changes, 



Fig. 35. — Pseudaspidodera pavonis. 



Posterior end of male ; lateral view. 

 I., left spicule; r., right spicule. 



Fig. 36. — Pseudaspidodera pavo- 

 nis. Posterior end of male ; ventral 

 view. 



I., left spicule (protruded) : r., 

 right spicule. 



the circular coat of muscles being much less strongly developed. The tube runs back 

 from this point quite straight to a distance of about o*8 mm. behind the vulva. Here 

 it doubles upon itself again, and at 

 about 0'i5 mm. behind the vulva gives 

 off the two opposed uteri. As in 

 Heterakis, the two oviducts, doubling 

 upon themselves in the anterior and 

 posterior halves of the body respect- 

 ively, return and cross each other so 

 that the coils of the ovary belonging 

 to the anterior uterus are disposed in 

 the posterior half of the body, and 

 those of the other ovary in the anteri- 

 or half. The ova are relatively large, 

 of somewhat oblong shape, with a thin 



Vulva and 



oi mm. 'c 



Fig. 37. — Pseudaspidodera pavonis. 

 vagina of female, in lateral view. 



c. .plug of cement in vulva. The arrow points in the 

 direction of the head. 



