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PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



width is attained just anterior of the tip of the tail. The spicule is 

 apparently much reduced or imperfectly chitinized and is not visible 

 with ordinary teclinique. The cloacal aperture is about 135 to 150 ]j. 

 from the posterior extremity of the body. The cloacal aperture is 

 situated on an elevation, but any papillae that are associated with 



it are so much reduced as to be un- 

 recognizable by means of the usual 

 technique. 



Female 2.58 to 4 mm. long and 190 

 to 250 [JL thick. The esophagus, ex- 

 clusive of the bulb, is 215 to 320 [jl long 

 and 42 to 52 [i. thick. The esophageal 

 bulb is 120 to 150 [/. long by 78 to 86 [x 

 thick. The nerve ring is 110 to 140 jx 

 from the anterior end of the body. 

 The intestine is considerably dilated 



e/?i 



105. 



106. 



Figs. 105, 106.— Oxyuris teteapteea. 105, Anterioe exteemitt showinq cuticuiab enlargements 

 X92.5. 106, Posterior EXTREMITY OF MALE, o, Dorso-lateralvlew; 6, dorsal view. X 170. 



at its anterior end. The anus is 430 to 600 jjl from the posterior end 

 of the body. The vulva is 1.075 to 1.66 mm. from the anterior end of 

 the body, and is a transverse slit with somewhat swollen lips (fig. 

 107). From the vulva the vagina proceeds forward a short distance 

 and then turns back to a muscular ovijector, and then a nonmuscu- 

 iar portion which communicates, through a vahailar structure, with 



