DISEASES OF HORSES AND CATTLE. 



282 



folds along the sides; in the female it is eonical 

 terminating in a point, the genital opening being 

 situated in the anterior fourth of the body. This 

 species produces vast numbers of eggs, which de- 

 velop embryos external to the body in water. Dr. 

 Cobbold states that he has reared free, active 

 embryos from these eggs by keeping them in 



Fi£. 20— The Round "Worm. 



water for five months. It is likely that horses 

 swallow these embryos in the water they drink 

 and if they are numerous they will cause some 

 disturbance to digestion. 



The symptoms are a rough, staring coat, a crav- 

 ing appetite, more or less emaciation with weak- 

 ness, the passage of mucus with the feces, a por- 

 tion of which very often remains outside of the 



