228 



PARASITES OF MAN 



eggs whilst still within the body of the pregnant female 

 contained tadpole-shaped embryos, and about the same time 

 the fact was noticed by Claparede. In his beautiful and 

 scholarly memoir, ' De la formation et de la fecondation des 

 ceufs chez les vers Nematodes/ he wrote concerning the ova as 



lio 46. Section of a female Oxyuris vermicularis, magnified 220 diameters (after Busk); 

 and also several free eggs (original), a. With an imperfectly formed embryo ; b, c, d, with 

 three tadpole-shaped embryos, magnified 450 diameters. 



follows : " The egg, which exhibits the form of a very narrow 

 disk in the ovary, acquires the shape of an elongated ellipsoid 

 in the oviduct, and at the surface differentiates itself into a very 



