(mit Ausschluss der Siphonophora) für 1907. 5 



I. Stolon-Formation in Tuhularia niesembryanthemuni: 1. Fre- 

 qiiency of Stolon-Formation, 2. Stolon-Formation in Different Regions 

 of tlie Stem, 3. Stolon-Formation and tlie Physiological Condition 

 of the Stem, 4. Stolon-Formation and the Length of the Piece, 5. Stolon- 

 Formation and Contact, 6. The Length and Form of the Stolons, 

 7. The Formation of Hydranths at the Tips of Stolons. IL Stolon- 

 Formation in Tuhularia marina. IIL Experimental Increase in Fre- 

 quency of Stolon-Formation. IV. Polarity in Tuhularia. Summary. 



— {%). An Analysis of Form-Regulation in Tuhularia. IL Diffe- 

 rences in Proportion in the Primordia. — Arch. Entw. Mech. Org. 

 23. Bd. (1907) p. 415— 44L 



Differences in Proportion in Primordia Different Sizes: Pieces 

 of 20, of 15, of 10 mm in Length, Summary of Results in all Series, 

 Relation between Change in Proportions and Distance between Pri- 

 mordia, The Proportions of Primordia of Different Sizes from Adjoining 

 Regions of the Stem, Measurements by other Observers. IL General 

 Considerations. Summary. 



— (3). An Analysis of Form-Regulation in Tuhularia. IL Regional 

 and Polar Differences in the Relation between Primordium and 

 Hydranth. — Arch. Entw. Mech. Org. 23. Bd. (1907) p. 445—456. 



I. The Relation between the Proportions of the Primordium and 

 those of the Hydranth: 1. Regional and Polar Differences in the Total 

 Length of the Primordia, 2. The Length of the Hydranth in Relation 

 to the Length of the Primordium. IL The Proportions of the Hydranths 

 after Emergence. Summary. 



— (4). An Analysis of Form-Regulation in Tuhularia. IV. Regional 

 and Polar Differences in the Time of Hydranth-Formation as a Special 

 Gase of Regulation in a Complex System. — Arch. Entw. Mech. Org. 

 2L Bd. (1907) p. 1—28. 



I. Experimental Data: 1 Regional and Polar Differences in 

 Time of Emergence in Distal and Proximal Half-Stems, 2 ... in 

 Pieces of One Third the Length of the Stem, 3. The Time of Emer- 

 gence of Oral Hydranths and the Length of the Piece, 5. The 

 Time of Emergence of Aboral Hydranths and the Length of the 

 Piece, 5. The Processes Affected by the Factors Determining the 

 Time of Emergence. IL Interpretations and General Considerations: 

 1. The Physiology of Asexual Multiplication, 2. The Essential 

 Difference between Oral and Aboral Hydranths in Tuhularia, 3. The 

 Significance of the Differences in Time of Emergence of Oral 

 Hydranths and of Aboral Hydranths, 4. The Significance of the 

 Differences in Time of Emergence between Oral and Aboral Hydranths. 

 III. Canclusions and Summary. 



— (5). Some Corrections and Criticisms. — Arch. Entw. Mech. 

 Org. 24. Bd. (1907) p. 131—146. 



Betrifft unter den Hydroiden Tuhularia. 



— (6). An Analysis of Form-Regulation in Tuhularia. V. Re- 

 gulation in Short Pieces. — Arch. Entw. Mech. Org. 24. Bd. (1907) 

 p. 285—316. 



