6 XVI d. Coelenterata. Hydroidea und Acalephae 



I. Keduction in Size of Regulatory Structures with Decrease in 

 Length of the Piece. II. The Character of the Structures Formet! 

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

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

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

 d) Conclusions and Summary. 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 Stem Accompanying Hydranth-Formation. 

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

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

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

 4. Frequency 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 between 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. 



Cialona, Marco (I). Catalogo di Animah pcscati nel Plankton del 

 porto di Messina e ben conservati vendibili presso. Messina P. Gennaio 

 1905. Tip. F. W. Kociol. 



Bietet von Hydroiden aus dem Hafen von Messina an Tuhularia, 

 Hippocrena swper ciliar is, Oceania armata, Liriope euryhia, Nausithoe 

 punctata, Solmundella mediterranea. 



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

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

 1907. 8 Seiten. 



Enthält von Hydroiden: Tuhularia, Hippocrene superciliaris , 

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

 mundella mediterranea, piccole Meduse diverse. 



Clarke, Samuel 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.]. 



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

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



Cunningtou, W. A. u. Boulenger, C. L. Biological Expedition to 

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



