NEMATODE GENUS PHYSALOPTERA. 



1069 



pass forwards to beyond the junction of the cesophagus and 

 intestine and then pass backwards, or they may pass backwards 

 directly. The uteri are more or less parallel, and their hinder 

 ends pass gradually into the receptacula seminis, about 380 jx 

 long by 150 /A broad. The receptacula seminis pass abruptly 

 into the oviducts, 38 [l in diameter, which soon join the ovaries ; 

 the latter pass forwards, taking more or less a convoluted course. 



Male. 



The males are slenderer than the females, fully-grown forms 

 being about 32 mm. long and 750 /x broad. The body is only 



Text-figure 37. 



Fhysaloptera antarctica v. Linst. 



A = Caudal extremity of male. B = Tip of left spicule. 



C = Right spicule. 



slightly attenuated anteriorly. The cuticle is of the same char- 

 acter as the female, and the cervical pa,pill£e occupy relatively the 

 .same position, being situated a short distance beyond the junction 

 of the muscular and glandular portions of the cesophagus. The 

 excretory pore is situated ventrally abqut 130 /* further back 

 than the cervical papillae. ■ The lips are as described for the 

 'female. 



The first part of the cesophagus is thinner than that following, 

 measures about 500 jjl long, and is surrounded at its base by the 

 nerve ring. The total length of the cesophagus is 3"55 mm, or 

 l/9th of the body-length. 



