The ultrastructure of the mucosa epithelium cell in the gasterointestional tract of theearthworm Pheretime califonia in the heavy metal polluted soil with TEM were observed inthis paper.The results indicated that the ultrastructure of mucosa epithelium cell of P. califonica wasdamaged obviously in slightly and heavely polluted area. Their pathological feature showed theperinuclear space of the cell expanded, mitochodria swelled or isoagglutined, mitochondiacristae dissappeared or appeared vacudar structure,...