Plate VII. 



Transverse sections through the body-wall in the region of the oesophagus; fig. 5 in the region of the 

 cnido-glaudular tract of the filaments, figs. 1—4 magnification 2 / 7 Reichert's "Austria". Figures drawn 



on a level with the stage of the microscope. 



Fie. 1 of Isozoanthus davisi. 

 — 2 - — islandicus. 



— dubius. 



— dcmicus. 



5 Parazoanthus haddoni (from N. W. of Bergen, Mattson 1880) 2 / 3 with drawn out tube. 



6 - — ? (from the Faeroes) 2 / 3 with drawn out tube. 



3 

 4 



