TREMATODE EGGS 35 



the liver or alimentary canal, and in the sputum, when 

 the parasites are living in the lungs or bronchi ; and 

 therefore microscopic examination of faeces or sputum 

 will show the presence of these eggs. These serve for 

 the diagnosis of the presence of the adult. 



Ova. The eggs of the Fasciolidae and Paramphistomidae 

 have a definite shell, usually yellow in colour, and with a lid 

 (operculum) at one end. In shape they are not quite oval, 

 as one end is narrower than the other. The contents 

 of this shell are the ovum, which forms only a small part, 

 and yolk-masses, a series of more or less rounded refractile 

 globules. The eggs of the human species have been fully 

 described; they differ in shape and colour to seme extent 

 but usually are best distinguished by their measurements. 



MEASUREMENTS OF TREMATODE OVA. 



Fasciola hepatica ... ... 0*13 by 0*08 mm. 



Fasciolopsisbuski ... .., 0*125 , 077 ,, 



Dicrocceliuin lanceatum ... 0*04 



Clonorchis sinensis ... ... 0*27 



Echinostoma ilocana ... ... 0*1 



Heterophyes heUrophyes ... 0*03 



Paragonitmis westermani ... 0*08 to 0*1 ,, by 0*052 to 0*075 mm. 



Go. st> odiscu v hominis ... ... 0*15 by 0*07 ,, 



Watsonius witsoni ... ... O'I2 ,, 0*075 



Schistosovium hxmatobium ... 0*08 ,, 0*03 ,, 



Schistosomum japonicum ... 0*06 to 0*09 ,, by 0*03 to 0*05 mm. 



Treatment of Intestinal Flukes in General. The intes- 

 tinal flukes are easily got rid of by treatment with thymol 

 used as for ankylostomes. Those in the bile-ducts cannot 

 be dislodged. 



0*03 

 0*016 

 0-06 

 0*017 



