Plate I. 



Fig. i. Campanularia integra. Part of median longitudinal section showing basal part of hydranth 

 and inner thickening of hydrotheca wall, to the upper side of which the hydranth is attached. 

 No trace of diaphragm whatever. Specimen from Herlo, near Bergen, fixed in picrin-subli- 

 mate-acetic acid (after Rabl), coloured with Delafield's hsematoxyline van Giesson. 



320/1. 



Fig. 2. Branch cerianthus reniformis. Type specimen from "Ingolf" St. 28. Nat. size. 



Fig. 3. Branchiocerianthus reniformis. Hydranth seen from below. 2/1. 



Fig. 4. Branchiocerianthus reniformis. Hydranth seen from above. The richly folded gastral endoderm 

 distinctly visible through the large oral aperture. 2/1. 



Fig. 5. Branchiocerianthus reniformis. Primary branch of a blastostyle, showing method of ramifica- 

 tion. The outer, grape-like swellings are close collections of quite small incipient gonophores. 

 30/1 



