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, i 4 magnification 2 / 7 Reichert's "Austria". Figures drawn 



on a level with the stage of the microscope. 



Fig. i of Isozoanthus damsi. 



2 - islandicus. 



3 - dubius. 



4 - danicus. 



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



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



