pericontinental portions of each ocean. The deep-water eutrophic 

 pericontinental zones of deposit-feeders occupy the continental and 

 island slopes, the deep-v"-^-- ■^ ' '"^ *""' 

 ocean f 1 oor at 

 zone of depos' 



and enriches l..^ ^.-. --. ,-. - - - - - 



zones of suspension-feeders, located near the center of the ocean. 



227 



