NEMATODE GENUS PHYSALOPTERA. 



1013 



directly take their origin, so that a common trunk portion is 

 absent. 



The eggs are oval and thick-shelled, measuring 52 yn long by 

 38 /x. broad. 



Male. 



The males varied in length from 15 to 28 mm., Avith a breadth 

 of 825 to 875 /x. The body is attenuated only on its anterior 

 half. 



The caudal bursa is large, forming about 1/1 1th of the total 

 length ; it is bluntly rounded posteriorly, and is closely coiled 

 ventralwards. The lateral expansions are well developed, and 



Text-fis'iu-o 2. 



^ ( 



Fhysaloptera clausa Rud. 

 A = Anterior extremity of bodj'. 

 B = Externo-lateral view of ip. 

 C = Ventral view of lip. 



the four pairs of pedunculated papillae supporting them are equi- 

 distant, two pairs being pre-anal and two pairs post-anal. There 

 are 13 ventral papillas, of which three are pre-anal and the rest 

 post-anal. The pre-anal papillss are situated in a row imme- 

 diately anterior to the anus, the middle papilla being larger than 

 the other two. The first two pairs of post-anal ventral papillse 

 are small and situated in a row just behind the anus ; the remain- 

 ing papillae ai-e equidistant and large, and they divide the tail 

 into quarters ; in some cases the last two pairs may be slightly 

 approximated to each other. 



The left spicule is nearly half as long again as the right, 

 and is also much slenderer ; it is 740 ju long by 33 /x broad at 



Proc. Zool. Soc— 1922. Fo. LXVITI. 68 



