6 XVI fl. Coelejiterata. Hydroidea und Acalephae 



I. Reduction in Size of Regulatory Stiuctures with Decrease in 

 Length of the Piece. II. The Character of the Structures Formed 

 in Short Pieces: Historical Review, 2. Experimental Data, 3. Dis- 

 cussion and Analysis of the Data : a) Facts and Conclusions, b) Single 

 Structures in Short Pieces, c) Double Structures in Short Pieces, 

 d) Conclusions and Siimmary. Zusammenfassung. 



— (T). An Analysis of Form-Regulation in Tuhularia. VI. The 

 Significance of Certain Modifications of Regulations. Polarity and 

 Fo'rm-Regulation in General. — Arch. Entw. Mech. Org. 24. Bd. (1907) 

 p. 317. 



I. Changes in the Stern Accompanying Hydranth-Formation. 

 II. The Effect of the Removal of Parts of the Primordia during Re- 

 gulation. III. The Effect of Dilution of the Medium. 1. The Length 

 of the Primordia, 2. Size of Hydranths, 3. The Length of the Stalk, 

 4. Frequcncy of Stolon-Formation, 5. Frequency of Aboral Hydranths, 

 6. Time of Emergence of Hydranths, 7. Length of Life of Hydranths, 

 8. Discussion. IV. General Considerations : 1. Polarity in Tuhularia, 

 2. Form-Regulation and Normal Growth, 3. Conclusion. — Summary. 



— (8). The Relation betwcen Functional Regulation and Form 

 Regulation. — Journal of Experimental Zoology Vol. 3, No. 4 (Dec. 

 1906). — Autorreferat im Arch. f. Entw. Mech. Org. 23. Bd. 

 (1901) p. 491. 



Ciiiloiia, Marco (I). Catalogo di Animali pescati nel Plankton del 

 porto di Messina e ben conservati vcndibili presse. Messina P. Gennaio 

 1905. Tip. F. W. Kociol. 



Bietet von Hydroiden aus dem Hafen von Messina an Tuhularia, 

 Hifpocrefia superciliaris, Oceania armata, Liriope eurybia, Nausithoe 

 functata, Solmundella mediterranea. 



— (3). Catalogo di Preparati microscopici di Animali pescati 

 nel Plankton del Porto di Messina. Messina, Tipografia d'Amico, 

 1907. 8 Seiten. 



Enthält von Hydroiden: Tuhularia, Hi/pfocrene super ciliaris, 

 Oceania armata, Liriope eurybia, Nausithoe punctata, Larve di Sol- 

 mundella mediterranea, piccole Meduse diverse. 



Clarke, Saimiel F. The Hydroids. — Cambridge, Mass., Mem. 

 Mus. Comp. Zoology Harvard Coli., Vol. 35 (1907) p. 1—18 + 15 1., 15 t. 



Agassiz' Exped. in den pacifischen Ocean. F. 



Congdou, Edgar Davidson. The Hydroids of Bermuda. — Boston, 

 Mass., Proc. Amer. Acad. Arts Sei., Vol. 42 (1907) p. 461—485, 37 fig. 



18 Arten, 8 n.; auch die schon bekannten zeigen Abweichungen 

 vom Typischen. S. Die gewöhnlichen Familien sind alle vertreten. F. 

 Textfiguren der Trophosome und Keimträger; die letzteren weichen 

 bei 2 neuen Halecium von den bisher beschriebenen stark ab. [N. B.]. 



Crenier, M. Über das Electrogramm der Medusen. — Sitzber. 

 Ges. Morph. Phys. München, 22. Bd. p. 41—45. F. 



Cuunington, W. A. u. Boiilenger, C. L. Biological Expedition to 

 the Birket el Qurun. — Nature Vol. 76 p. 316. F. 



