376 



E. A. ANDREWS. 



Folliculina. In the water also some free-swimming Folliculina 

 could be seen near the surface swimming all through the water 

 as well as close to floating plants. 



Out in the Severn River a two-quart jar of water taken up at 

 random at the surface showed several free-swimming Folliculina; 



FIG. 3. Photograph of a preserved colony that had been formed on surface 

 of the water in aquarium ; showing form of case and tube spirals as well as animal 

 rectracted within case. Enlarged 30 diameters. 



three days later these had settled down on the side of the jar and 

 were in two groups, two individuals in one and five in the other, 

 so that at least seven were in the two quarts of surface water, 

 which would make an immense number for the entire river. 



