OXYURIS VERMICULARIS. 221 



Spec. Char. Anterior capillary part the longest ; head 

 pointed, indistinct; body of the male twisted in a 

 spiral form. 



Tricliocepbalushominis; St/st. Nat. Gmel. p. 5037; Goeze, Eingeio, p. 112, t. 6, 

 f. 15. Trichocephalusdispar; Rudol. Ent. p. 16. Trichurus vulgaris; Hoop. 

 Mem. Lond. Med. Soc. v. p. 252. Ascharis tiichuria; Wern. Verm. Intest. 

 p. 84. 



La Trichiure de VHomme> Pr.} Der Peitschenwurm, Ger. 



This Worm, when full grown, is about two inches in length, and 

 of a pale yellowish colour. The anterior end is capillary and 

 double the length of the posterior, terminating in an acute point, 

 where the mouth is situated. The posterior part is thick, and 

 swells out to a considerable size ; and in the male it is twisted 

 round in a spiral form. Each sex is in a different individual ; the 

 alimentary canal is straight, and around it lie the organs of gene- 

 ration. The female is distinguished from the male by having a 

 somewhat larger anterior part, and from the posterior end being 

 rarely found bent. The Trichocephalus or hair-headed worm, was 

 formerly called trichurus, or hair-tailed, the head having been mis- 

 taken for a tail. This species was first discovered in 1761, by 

 Rhccder, at Goettingen, in the bodies of some French soldiers who 

 had died of a contagious disease. It is found chiefly in the coecum j 

 is generally numerous, and much more common in infants. 

 Rudolphi found more than a thousand in one individual. 



OXYURIS VERMICULARIS, 



The Maw, or Thread- TVorm. 

 Pl. XXIX. fig. 3, 4. 



Order Nematoidea, Rudolphi. 



Gen. Char. Body round, elastic ; posterior part of the 

 female awl-shaped; mouth orbicular; penis in a sheath. 



