DROP III. 



THE objects contained in the drop under con- 

 sideration are of a different character to those 

 in the last. Many of them have very lively 

 movements, others are attached, but at the 

 same time full of life and motion. One family, 

 the Vorticellina, will be found highly interesting, 

 and, most of them being fixed to weeds, they 

 are more easily examined than many others. 

 Two small and insignificant families are ar- 

 ranged before it in the classification. The family 



