22 SURVEY OF LUMINOUS ORGANISMS 



Column 7. Marked inhibition of luminescence of single-celled organisms 

 or of luminescent extracts by sunlight are indicated by + and no marked 

 inhibition by — . A + and a — indicate that some species show light inhibi- 

 tion, others not. DN indicates that there is a day-night rhythm of lumi- 

 nescence such that the intact living organism does not luminesce in the 

 daytime even if kept in the dark. 



Column 8. Many luminous organs are brightly fluorescent in near ultra- 

 violet light or become so after functional activity. The color of the fluo- 

 rescent Hght (usually near that of the bioluminescence) is indicated. A — 

 sign means no marked fluorescence. 



Column 9. The color of the bioluminescent light is recorded, but too much 

 reliance must not be placed on color estimation by eye observation. The 

 wavelength of maximum emission is also given where spectrophotometric 

 curves are known. 



