Regeneration . ed the new part becomes almost as broad as the old piece, butif the worm is not fed the old part decreases in breadth and the new part does not grow asbroad as in the former case. 136 REGENERA TION the head that regenerates from an undivided stem, yet the number oftentacles on each head is more than half the average number. Thisis connected apparently with the fact that the circumference of eachhalf is greater than half the circumference of the original with double tails, produced by partial splitting, have beendescribed by Duges and by Faraday, and it has also b
Regeneration . ed the new part becomes almost as broad as the old piece, butif the worm is not fed the old part decreases in breadth and the new part does not grow asbroad as in the former case. 136 REGENERA TION the head that regenerates from an undivided stem, yet the number oftentacles on each head is more than half the average number. Thisis connected apparently with the fact that the circumference of eachhalf is greater than half the circumference of the original with double tails, produced by partial splitting, have beendescribed by Duges and by Faraday, and it has also been shownthat by partial splitting of the anterior end of the worm two headscan be produced. Van Duyne, Randolph, and Bardeen and I haveobtained the same result. Each half completes itself on the cut-sideand produces a symmetrical anterior end. If one of the heads is cutoff, it will be again regenerated. If the heads are united very near tothe trunk, as in Fig. 42, A, they may never grow to the full size of the.
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