84 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 50. 



OXYURIS SCIURI Hall, 1916, new name. 



/Synonym. — Oxyuris species Parona, 1889. 



Specific diagnosis. — Oxyuris (p. 65) : Head not inflated. Mouth 

 with papilhie and with distinct internal foldings. Club-shaped 

 esophagus with esophageal bulb. Intestine large and straight. 



3/ ale unknown. 



Female 17 mm. long and 49 jw (?) thick. The body is much at- 

 tenuated posteriorl3^ The swollen portion of the esophagus proper 

 is 750 fi from the anterior end and is 70 fi in diameter. The bulb is 

 21 fi in diameter. The anus is very small and is 40 /x (?) from the 

 tip of the mucronate tail. No anal papillae visible. The vulva is 

 6 mm. from the anterior end. The oviducts are in compressed, ser- 

 rate loops; the ovaries are very long. 



Host. — Sciums atrodorsalis. 



Location. — Nares and mouth (?). 



Locality. — Kokarit. 



Parona had five females of this species and states that the fact that 

 his material included no males prevented him from describing it as a 

 new species, although he believes it to be new. While it is a good gen- 

 eral rule to have' both sexes, and especially the more distinctive male, 

 it is a rule with limitations and these limitations are especially ap- 

 plicable in the genus Oxyuris^ where the males are small, easil}'^ over- 

 looked, short lived, and rare. That a carefully described female 

 Oxyuris is readily recognized is proven in such a case as that of 

 0. evoluta., the male of which is first described in this paper. Ea'cu 

 in the case of such a form as Parona 's, his comparatively incomplete 

 description will probably prove sufficient to permit of immediate 

 recognition of material from the named host. 



Parona states that these worms must have been found in the stomach 

 or intestine. There must have been some error in the labeling which 

 indicates the collection of these worms from the nares and mouth. 



I have queried the figures given for the thickness of the body by 

 Parona, on the grounds that it hardly agrees with the general rela- 

 tions of Oxyuris. Ten times the figure given would be more likely. 

 For the same reason I have queried the dimensions given for the 

 distance from the anus to the tip of the tail. 



Parona states that the esophageal bulb has two swellings. I have 

 interpreted this as a reference to the posterior dilatation of the 

 esophagus proper and to the esophageal bulb. 



OXYURIS STOSSICHI Setti, 1897a. 



Specific diagnosis. — Oxyuris (p. 65) : Cuticle finely but somewhat 

 irregularly striate transversely. Anteriorly the cuticle expands 

 laterally to form two alae, the length of which varies with the speci- 



