NO. 2131. 



NEMATODE PARA^^ITES OF RODENTS— HALL. 



59 



It is fusiform, 112 to 130 [a long and of variable width owing to con- 

 traction and folding of the flexible edges. These cuticiilar mem- 

 branes are on the lateral margins 

 of the sucker, but are apparently 

 lacking in the median line anteriorly 

 and posteriorly. The posterior 

 border of the sucker is about 515 to 

 600 [K from the tip of the tail. 



Female 7.39 to 7.9 mm. long and 

 345 to 415 [x thick in the region of 

 the vulva. The posterior end of the 

 body terminates in a blunt point. 

 The esophagus, exclusive of the 

 bulb, is about 430 to 535 [jl long and 

 56 to 70 ^ thick. The bulb is 198 

 to 240 ^ long and 130 to 185 [i. 

 thick. Nerve ring 170 [/. from head 

 in one specimen. The anus is about 

 1.65 mm. from the tip of the tail. 

 The vulva is at the union of the 

 anterior and middle thirds of the 

 body, 1.8 to 3.265 mm. from the 

 head. The vagina has its walls 

 wound with a close spiral similar to ^'l\,,fr^I'i^Z'^2ri'L ;^r?"''^- 



i Vulva region of female, showing 



that of Ueterakis spiniiosa., and ex- position of vagina, x 92.5. 



/?a^ 



IIeteeoxynema cucullatum. Eggs, x 340. 



tends forward from the vulva toward the head and then turns back 

 toward the tail (fig. 68) . The posterior portion of the body is densely 



