Plate III. 



Vertical sections through the sphincter muscles. In the figs, i 3, 5 the distal part of the sphincter is 



turned upwards, in the figs- 4 and 6 downwards. 

 Fig. i of Epizoanthus abyssorum 2 / 3 : . 



2 - beerenislandicus t/ 3 . 



3 - norvegicus (from Skarnsound) 2 / 3 . 



4 - roseus 2 / 3 . 



5 - Isozoanthus arborescens (from Ingolf Exp. St. 97) 4/ 3 . 



6 - Parazoanthus haddoni (from N. W. of Bergen, Mattson 1880 2 / 3 ). 



1 Magnifications refer to Reichert's system "Austria". Figures drawn on the level of the microscope's foot. 



