FEEDING REACTIONS IN DILEPTUS GIGAS. 



121 



per cent, of the individuals tested was there more than one vacuole 

 containing carmine formed. 



Table II. contains the results of ten experiments with powdered 



TABLE II. 



EXPERIMENTS ON BLUE GLASS 



Table showing the results obtained in feeding Dileptus on powdered blue 

 glass. In the five columns under the headings 04, are indicated the number 

 of individuals which formed o, i, 2, 3, 4, or more vacuoles containing blue 

 glass, respectively, during the twenty minutes of the experiment. Glass was 

 ingested by 89.3 per cent, but in only 12 per cent, was there more than a 

 single vacuole containing glass formed. 



blue glass. It shows that eighty-nine per cent, were observed with 

 vacuoles containing glass ; that although so large a percentage had 

 ingested glass to some degree, yet only twelve per cent, formed 

 more than one vacuole ; and that only two per cent, were observed 

 with more than three vacuoles containing glass. It is therefore 

 evident that while glass is ingested, it is taken only in very small 

 amounts. 



Table III. contains the results obtained with india ink. It shows 

 that almost ninety-five per cent, contained at least one vacuole with 

 ink particles in it, and that only twenty-seven per cent, had formed 

 a second vacuole during the entire twenty minutes. We can con- 

 clude, therefore, that ink is eaten in small amounts by the great 

 majority of specimens of Dileptus, but that only relatively few 

 form more than two vacuoles containing this substance. 



