REGENERATION INPOLYCHŒRUS CAUDATUSMARK

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Abstract
Several types of regeneration and grafting in P. caudatus are described and discussed. Lateral regeneration in Poly-choerus occurred in the absence of the median ganglionic mass. Lateral-anterior and lateral-posterior regeneration occurred in the absence of both median and lateral ganglionic masses. The statocyst, however, did not regenerate. When the marginal posterior regions were separated from each other, 2 or more caudal lobes formed. The amount of this regenerated posterior region may be controlled by the length of the cut, removal of middle tissue, or amount of wound closure. Head formation may appear between the new posterior sides. Reverse grafts between anterior surfaces occurred. If graft was not complete, a head regenerated from region of union. Posterior regeneration resulted from transversely and obliquely sectioned reverse grafts. Absorption of the smaller graft may occur.

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