[Unusual way of regenerating intestinal epithelium during seasonal intestinal transformation in Stichopus japonicus holothurians (possibility of an "external cambium")].

In Stichopus japonicus during summer months a profound morphofunctional rearrangement of the digestive tract resulting in its renovation is noted. It includes certain destructive-atrophic changes in the wall of the intestinal tube and some reparative processes accompanying them. In some species a spontaneous throwing out of the intestine with its subsequent restoration takes place.