BARBADOS-ANTIGUA REPORTS 121 



party, but I have not noted that the depth below the surface was 

 as great as six inches. In many cases the animals are just below 

 the surface. As a rule the larger the animal the more deeply it 

 is buried. Probably the animals move up and down in the sand 

 with changes in temperature and tidal conditions, and no doubt 

 the larger individuals move more rapidly and greater distances 

 than the smaller ones. The food is certainly in large part di- 

 atoms and other unicellular organisms. 



Museum of Comparative Zoology 



Cambridge, Mass. 



May 28, 1920 



