Plate IV. 



Figs. I — 3. Aracliiiactis albida. Figs. 4, 5. Crrianf/ms loydii. Figs. 6 — 8. Botrucnidifer uorvcgicits. 

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

 Similar section 10 // below that of fig. i. 



» » 1 60 a » » » 



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

 Section of abont half a yonng specimen a little before the stomatodaeum. 

 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 cuidorage 

 with the mesentery. 



— 2 



— 3 



— 4- 



— 5- 



— 6. 



