58 PLATE XXVI. 



This fpecies of Vorticella appears, without the affiftance of a micro- 

 fcope, as fmall black fpecks, fvvimming on the water, particularly in 

 meadows which are inundated. They are confrantly in motion ; and 

 two fmall white hooks are perceptible by glaffes at i — i ; by the help 

 of thofe it is fuppofed to fwim 5 or they may inclofe fome rotatory or- 

 gan. The infect is opaque. 



PLATE 



