NEMATODE GENUS PHYSALOPTERA. 



1061 



pointed, forming l/45th of the total body-length, and has its 

 caudal pores situated in its posterior third. 



The vulva is situated on a slight elevation at the junction of 

 the 1st and 2nd body fifths; it leads into a long and thick- 

 shelled vagina 2*2 mm. long by 95 /x broad. This vagina passes 

 straight backwards to join the egg-chamber, which is also large 

 and straight, measuring 1-8 mm. long by 380 /jl broad. The hind 

 end of this chamber narrows sharply to join the common trunk, 

 which is 760 /* long and 90 /x in diameter; its posterior end divides 

 into two, each of which in their turn subdivide to give rise to 

 the four uteri. These two primary branches are so short as- 

 to almost give the appearance that the uteri all arise at the same 

 level. 



Text-figure 32. 



Physalo'ptera quadrovaria Leiper. 



A = Anterior extremity of body. B = Inner view of lip. 



C = Mode of origin of uteri. 



The eggs are thick-shelled and oval, measuring 51 yu, long by 

 36 ju, broad ; they embryonate in iijtero. 



Male. 



The solitary and incomplete male is 19*5 mm. long and 750 /a 

 thick. Part of the left spicule — the bursa is broken oW just in 

 front of the anxis — is seen inside the body, but nothing remains 

 of that of the right side. The remaining portion of the left 

 spicule is long and filiform, measuring I -3 mm. long. The spicules 

 are probably vei-y unequal. 



Host: Varanus niloticus. Intestine. Sudan. 



Discussion. — See Ph. varani. 



Proc. Zool. See— 1922, No. LXXI. 



71 



