These cells remain in the attached, now basal, end of the metamorphosing animal [ILLUSTRATION FOR FIGURE 18 OMITTED]; where the upright portion of the pawn connects to the basal disc is a sharp demarcation between presence of interstitial cells in the base and absence of these cells above the base.
In the attachment area (basal disc) a few interstitial cells are found in both the ectoderm and the endoderm.
These cells are confined to the substrate-attached basal disc region of the metamorphosing animal and resemble the pattern described for the disc stage (Table I).
In the pawn a few ganglion cells differentiate in the basal disc (Table I).