338 



THE ANIMAL PARASITES OF MAN 



3. Ascaris maritima, Leuckart, 1876. 



Only one immature specimen, a female (43 mm. in length and 

 I mm. in breadth), has hitherto been described, and it was vomited 

 by a child in North Greenland in 1865. (R. Leuckart, Die 

 menschlichen Parasiten, 1876, i., edition ii., p. 877.) 

 rif 



13. Gen. Oxyuris, Rudolphi, 

 1803. 



The three labial papillae are only 

 slightly protuberant, the oesophagus 

 is long and presents a distinct dila- 

 tation. The male has one spicule 

 and two pairs of pre-anal papilla ; the 

 posterior end of the female is drawn 

 out to a point. The vulva is in the 

 anterior part of the body. 



Oxyuris vermicular is (Linne), 

 1767. 



Syn. : A scar-is vermicularis, L. ; Fu- 

 saria vermicularis, Zeder, 1803. 



Colour white, the annulated 

 cuticle forms swellings at the 

 anterior end which extend some 

 distance back along the middle 

 of the ventral and dorsal sur- 

 faces ; the longitudinal supports 

 of the skin corresponding to the 

 lateral ridges are much more feebly 

 developed ; there are three small 

 retractile labial papillae around 

 the mouth. The male measures 

 FIG. 222. On the 3 5 mm . i n length, and shortens 



left, female ; on the j , ,, 



right, male ; greatly on death ; the posterior extremity 

 enlarged. A., anus ; o f the body is rolled ventrally and 



M., mouth ; V., vulva. .- / 



(After ciaus.) presents six papillae. The female 



is 10 mm. in length and 0*6 mm. 



-in diameter ; the anus is about 2 mm. in front of the tip of 

 the tail ; the vulva is in the anterior third of the body ; the eggs 

 are oval, thin-shelled and measure 0*05 : 0-016 0-02 mm. ; they 

 are deposited with embryos already developed and are very seldom 

 found in the faeces. 



FIG. 221. A., 

 male ; and B., 

 female, of Oxy- 

 uris vermicula- 

 ris. (s/i.) 



