CLASSIFIED RESUME OF ORGANISMS OBSERVED 303 



pared with the copepods; when identifiable these were 

 always traceable to larger animals, except in the three 

 cases mentioned. 



Movement was of the well-known jerking character, 

 accomplished by an oar-like use of antennae. This motion 

 was apparently unaffected by the beam, which was occa- 

 sionally switched on for several minutes at a time, a pe- 

 riod ample for indicating any positive or negative photo- 

 tropism. When I focused with low-power binoculars at 

 the very end of the beam, forty-five feet away, I could still 

 see traces of plankton. 



Orders schizopoda and decapoda 



Shrimps and schizopods were recorded thirty-nine times 

 during the bathysphere dives. These were all of fair size, 

 ranging between one and eight inches in length. Innumer- 

 able small ones, of course, must constantly have escaped 

 notice. 



The gradation of one color zone into another was well 

 illustrated by these animals. Down to 400 or 500 feet, all 

 those observed appeared pure white. For several hundred 

 feet below this, white, white-and-pink, and pale pinkish 

 shrimps were seen in about equal numbers. Finally, be- 

 ginning at about 1400 or 1500 feet, the first of the large 

 scarlet shrimps and schizopods of the true deep-sea types 

 appeared, fully 1000 feet higher than we usually take them 

 in our trawling nets. 



Luminescence was repeatedly observed. Two general 



