55* 



THE LOWEST ANIMALS. 



ooze, live at the bottom as well as at the surface, has given rise to much discus- 

 sion. Dr. Murray has come to the conclusion that pelagic species do not live near 



\ 



Polystomella (magnified 200 diameters). 



the ocean floor. His opinion is partly based on the fact that the area of Glob- 

 igerina ooze coincides with the area of surface temperature at which Globigerinas 



