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PROCEEDINGS OF TEE NATIONAL MUSEUM. 



VOL. 50. 



80 IX. The esophageal bulb attains a maximnm length of 125 /u, and 

 a maximum thickness of 110 to 115 ju. The nerve ring is 170 to 215 /* 

 from the anterior extremity of the body. The anus is 850 to 950 /* 

 from the posterior extremity of the long narrow tail (fig. 114). The 

 cuticular striations continue to the very tip of the tail. The vulva 

 (fig. 115) is located about 1.5 mm. from the anterior extremity of the 

 body and is a transverse slit lying between the enormously devel- 



^j:. 



:A//^_ 



Fig. hi.— Oxyuris triradiata. Esophageal bulb. X 340. 



oped anterior and posterior lips. The part of the body lying inside 

 of the cuticle is depressed by the pushing in of the vulva while the 

 depression is filled on the outside of the cuticle and beyond the line 

 of the body by the large cuticular labia. From the extreme borders 

 of the two lips the anteroposterior measurement attains a maximum 

 of about 500 /i. This vulva is readily visible to the naked eye. The 

 short muscular vagina extends posteriorly and communicates with 

 the uterus. Apparently the reproductive tubes do not extend pos- 

 terior of the anus. The ovaries extend forward almost or quite to 

 the region of the esophagus. Eggs not found. 



