98 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



Host. — Atlantoxerus getulus {Xerus getulus). 

 Location. — Cecum. 

 Locality. — Mogador, Morocco. 



Seurat states that the male of this species has its closest affinities 

 with 0. stroma, but that the females of the two species are so dif- 

 ferent that he wonders if the female described for 0, stroma is 

 really the female belonging with the male of that species. He also 



states that these two species are related to 

 O. hilgerti and 0. ohvelata. 



OXYURIS POLYGON von Linstow, 1909. 



Fig. 120. — OxYURis pallarvi. 



GUBERNACULUM. ENLARGED. 



After Seurat, 19loa. 



S2'>ecific diagnosis. — Oxyuris (p. 65) : The 

 cuticle is transversel}^ striated at inter- 

 vals of 7 to 8 [J,; anteriorly it is strongly 

 thickened over a distance of 120 [x, the body parenchyma being thin- 

 ned over the same interval. The rounded head end bears three lips. 

 The esophagus is thin and terminates in a spherical bulb provided 

 with teeth in the interior; the esophagus and its bulb are separated by 

 a slight constriction ; the small posterior half of the esophagus is pig- 

 mented brown ; the esophagus is two- 

 sevenths of the body length in the 

 male and five twenty-thirds of the 

 length in the female. The nerve ring 

 encircles the esophagus about 180 \i 

 from the anterior end of the body. 

 The excretory pore is on the ventral 

 surface in the neck region near the 

 constriction between the esophagus 

 and its bulb. 



Male 3.26 mm. long and 330 [x 

 thick; the tail is one seventy-fourth 

 of the total length and is bent toward 

 the ventral surface in the form of a 

 hook, foi-ming a coil of two turns. 

 The vesicula seminalis is very large, 

 with a length equal to about one- 

 fourth of the entire body length. 

 The testes extend so far anteriorly 

 that they divide the body in the ratio 

 of 11 :8 anteriorly and posteriorly (meaning of original description 

 not clear). The spermatozoa are flat, 16 [jl long and 10 [jl thick. The 

 spicule (fig. 121) is 230 [x long and is forked at its proximal extrem- 

 ity. There are four pairs of prominent conical papillae, of which 

 one pair is preanal, one adanal, and two pairs postanal. 



Fig. 121.— Oxyuris polygon. Posterior 



EXTREMITY OF MALE. ENLARGED. AFTEK 



VON Linstow, 1909. 



