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PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



The resemblance between the bursa in this species and that of the 

 type species of the genus, O. equi, is rather interesting. 



I am indebted for the alcoholic host material from which these 

 worms were collected to Mr. E. R. Warren, of Colorado Springs. 



Fig. 114.— Oxyxjris triraduta. Poste- 

 rior EXTREMITY OF FEMALE, an., ANU.S. 

 X 46. 



Fig. 115.— OxTUEis triraduta. 

 Female ra region of vulva, 



SHOWING development OF 

 CUTICLE anterior AND POSTE- 

 RIOR OF VULVA. X 170. 



OXYURIS UNGULA von Linstow, 1906. 



Specific diagnosis. — Oxyuris (p. 65) : Mouth with three lips. The 

 esophagus is club-shaped, the diameter increasing posteriorly, and is 

 separated by a constriction from the esophageal bulb. The bulb 

 equals one-fifth of the total length of the esophagus. The anterior 

 portion of the intestine has a smaller diameter than the esophageal 

 bulb. The lateral cervical glands, 260 ju, long, extend anteriorl}^ along 

 the esophagus. There are two cer^dcal alae with a diameter ecjual to 

 one-ninth of the body diameter and terminating posteriorly at a 

 point opposite the posterior end of the esophagus. The cuticle is 

 transversely striate. 



MaU 2.12 mm. long and 180 ii thick. Esoi>hagus one-fifth of the 

 total body length. The tail is one twenty-second of the total body 

 length and is hoof-shaped in lateral view (fig. 116). On each side 

 are two projections, of which the anterior is round and directed later- 

 ally and the posterior is more spherical and directed posteriorly. 



