NEMATODE GENUS PHYSALOPTERA. 



1051 



The vulva is situated very far forwards, opening to the exterior 

 on a slight elevation in front of the hind end of the oesophagus. 

 The muscular vagina is very short, measuring only about 480 /^ 

 long by 50 fx broad; its hind end is very slightly enlarged, and 

 from its outer sides the two uteri take their origin in the same 

 manner as in Ph. prceptotialis v. Linst. ; the thin initial portions 

 of the uteri are swollen in their middles, after which they again 

 become thin and also much convoluted, after which they join up 

 with the much thicker and egg-containing part of the uteri. 



The eggs are large, oval, and thick-shelled, measuring 51 fx, 

 long by 42 fi broad ; they are fully embryonated m utero. 



Male. 



The males are much smaller and slenderer than the females, 

 measuring only 18 to 23 mm. long by 620 to 740 /^ thick in 



Text-figure 26. 



Fliysaloptera aoutieauda Mol. 

 A = Terminal portions of female genitalia. 

 B = Caudal extremity of male. 



their posterior third. From about the posterior third the body 

 tapers gradually towards the anterior end. 



The caudal bursa has well- developed lateral wings supported by 

 four equidistant, pedunculated and paired papillae, two pre- and 

 two post-anal. Of the three pi'e-anal ventral papillse the median 

 one is lodged nearer the anus than the other two, and is also 

 larger. There are five pairs of ventral post-anal papillae, of 

 which the 1st and 2nd pairs ai'e situated in a row imme- 

 diately behind the anus. The distance between the 4th and 

 last pairs is about twice the distance between the 2nd and 

 3rd pairs. 



