Plate IV. 



Figs, i 3. Arachnactis albida. Figs. 4, 5. Cerianthus loydii. Figs. 68. Botrucnidifcr norvcgicus. 

 Fig. i. Section of two mesenteries at the extreme aboral border of the stomatodaeum. 

 2. Similar section 10^ below that of fig. i. 



4. Section of a craspedoneme of the cnido-glandular tract on a mesentery of the second cycle. 



5. Section of about half a young specimen a little before the stomatodaeum. 



6. Section of the column and a mesentery with botrucnidae. 



- 7, 8. Sections of cnidorages. In fig. 8 is seen the mesogloea stalk which connects the cnidorage 

 with the mesentery. 



