Article révisé par les pairs
Résumé : In the cerebroid ganglia of the adult Eisenia foetida in the egg-laying period there exist 4 types of neurosecretory cells: 2 species of 'a' cells types 1 and 2; of puberty cells, type 3; and of laying-period cells. The ultrastructural pattern of these cells and of their axone is described at different moments of their development.