NEMATODE GE^^US PHYSALOPTERA. 



1081 



other, the centre one being large and situated nearest to the 

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

 more or less equidistant from each other ; the 2nd, 3rd, and 4th 

 pairs of these are obliquely situated across the tail, whereas the 

 1st and last pairs are arranged transversely. 



The spicules are unequal, the left being longer and slenderer 

 than the right. The right spicule is 370 by 50 /x thick at its 

 base ; it tapers to a rounded tip. The left spicule is 523 jx long 

 by 20 ,u broad at its base, and tapers to a fine point. 



Text-figure 44. 



Fhyscdopte^'a sp. 

 A = Latero-veiitral view of cephalic extremity. 

 B = Caudal extremity of male. 



The ventral surface of the bursa is ornamented with longi- 

 tudinal rows of somewhat rounded tubercles. 



Host : Perameles nasuta. Stomach. Australia. 



I have not attempted to classify this species, because only a 

 single specimen was available for study, and the arrangement of 

 its bursal papillse difi"ered so much from the typical that I 

 consider the specimen to be abnormal. 



PART II. 



Group Dideiphys. 

 (32) Physaloptera rara Hall & Wigdor, 1918. 



Male unknown ; length of female 24 mm., maximum thickness 

 1*34 mm. 



Anterior extremity somewhat attenuated. Cuticle strongly 

 annulated, and first annulation behind the head forms a sort of 

 collar, into which the head is partly sunk. 



