infus6ria. 



153 



5. Din6bryon (Fig. no). 

 In the early spring, as early as March, among the 

 Algffi then found Jo abundantly in the shallow popls, 

 colonics of very small, vase-shaped "loricEe are often 

 obtained. They are sometimes attached to a plant or 

 filament of Alga, or as often they float freely through 

 the water, as they are fastened to the plant by a very 

 slight tenure, and are easily detached, then floating 

 freely. 



The loricse are transparent and 

 colorless, and may be overlooked, 

 but the Infusorium within each one 

 is rather conspicuous to even a low- 

 power objective, for it has a narrow 

 green band on each side of the 

 body, and often a minute red eye- 

 Mike spot in the center of the front 

 "border. The loricse are united to- 

 gether into colonies by the attach- 

 ment of one or two sheaths to the 

 front edge of the one behind, until 

 branching clusters, of some size are 

 foimed. 



/The front border of each enclosed 

 Infusorium bears two flagella, one 

 ^long and one short, but they are 

 seen with difficulty even with a 

 fhoderately high-power objective. 

 The lashing of all the flagella in a 

 large colony urges it rapidly through the water. Ac- 

 cording to my experience Dindbryon is seldom found 

 in the summer. 



