THE 



CHANGEABLE CERCARIA. 



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Generic Character. 



Worm unobfervable by the naked eye, fomewhat 

 pellucid, tailed. 



Specific Character. 



GREEN CERCARIA, (fometimes red,) with 

 cylindric mutable body, and (lightly bifid 

 pointed tail. 



The animalcule of which microfcopical figures, very 

 highly magnified, are reprefented on the annexed 

 plate, is amongft thofe legions of animated beings 

 which, in the warmer months, contribute to people 

 the generality of ftagnant waters ; fometimes covering 

 the whole furface with a continued meet of a red or 

 green colour, and fometimes diffuling a ftrong tinge of 

 thofe colours throughout the whole mafs or body of the 

 water. The general fhape of this animalcule is not 

 much unlike that of a Aug, but its motions are more 

 analogous to thofe of a leech. In its poftures it is 

 infinitely variable, pofTeffing, like many others of the 



animalcular 



