EPISTYLIS. 



95. 



tubes, which are often found empty in the ponds 

 they frequent. The Melicertas are conveniently 

 viewed with a power of from sixty to one hundred 

 linear, and a colony of them may be kept alive 

 for some weeks in a glass jar or tank. 



Among the remainder of my tiny captives were 



Epistylis. 



two beautiful members of the Vorticella family, 

 Epistylis and Carchesium. The reader will remember 

 that in the Vorticella previously described, the bells 

 stood upon stalks that were very flexible, and re- 

 tractile by means of a muscle running down their 



