Plate 1. 



Pachyceriantlms viiiltiplicatiis. 

 Fig. I. Natural size. 



— 2. Section of three mesenteries with the adjacent parts of the stoniatodaeuni and column. Ecto- 



derm of column not shewn. 



— 3. Section of a portion of a marginal tentacle. 



— 4. Section of a hemisulcus with adjacent portion of directive mesentery. 



— 5. Section of craspedoneme (Mesenterialfaden der Flimmerstreifenregion). 



— 6. Section of cuido-glandular tract ("the simple portion of the mesenterial filament" — "Nessel- 



driisenstreifen", "le filament pelotonne"). 



