NEMATODE GENUS PEYSALOPTERA. 



1035 



3rcl and last quai'fcers. The whole organ forms in the male 

 l/5"6, in the female l/7"6 of the body-length. 



Female. 



The female is slightly attenuated towards both extremities, 

 and is terminated posteriorly by a slender tail, forming l/56th part 

 of the body. Its caudal pores are situated at the junction of its 

 2nd and last thirds. The maximum breadth of the largest 

 female is 1'3 mm. just behind its middle. 



The vulva is situated in a depression partly overhung by an 

 anterior cushion-like thickening of the body ; it divides the body 

 in the ratio 1 : 2*5. The vagina is coiled, and is 1*2 mm. long by 

 95 // thick ; the following egg-chamber is about 1 mm. long and 

 twice as broad as the vagina ; its posterior end divides into two, 

 and each branch joins Lip with a uterus, a common trunk being 

 absent. The anterior half of the vagina, the egg-chamber, and 

 the terminal portions of the uteri are directed forwards, the 



Text-figure 16. 



Fhysaloptera honnei, sp. n. 

 A = Outer view of median teetli. 

 B = Terminal portion of female genitalia. 

 C = Receptaculum seminis. 



uteri extending as far as the base of the oesophagus, when they 

 bend sharply backwards and pass almost to the posterior end of 

 the body. The receptacula seminis are pear-shaped, and are 

 480 fx long by 265 jj. broad at their junction with the oviducts. 



The eggs are elongate, oval, and thick-shelled, and contain fully- 

 developed embryos ; on the average they are 42 fx long by 

 25 jit broad. 



Male. 



The males are much thinner than the females, the diameters 

 of the larger and smaller worms being respectively 950 and 850 jx. 

 The bursa is large, forming about l/14th of the body-length, and 

 is nearly twice as long as broad. Ventrally it is ornamented 

 with longitudinal rows of cuticular elevations. The four pairs of 

 pedunculated lateral papillas are equidistant, two pairs being pre- 

 anal and two pairs post-anal. The three pre-anal papillae are 

 situated in a row just above the anus. Behind the anus there 



