Plate V. 



Fig. 1—6. Ccriantheopsis americamis. Figs.. 7, 8. Araclinactis albida. 

 Figs. 9, 10. Bofnicuidifer norvegiciis. Fig. 11. Cerianfkus lloydii. 

 Fig. I. Section of a craspedoneme of a craspedion some way from the extremity. 



— 2. Similar section nearer the base of the craspedoneme. 



— 3. Section of a portion of a fertile mesentery in the region of the sexual organs, together with 



craspedion. 



— 4. Section of the aboral portion of an hemisulcns. The hemisulcus is the part shewing cilia. 



— 5. Part of the second protomesentery in the craspedoneme and cnido-glandular tract region. 



— 6. Part of a mesentery with a craspedoneme of the craspedion region. 



— 7. Section of a portion of a mesentery with a craspedion in the oral portion of the latter. 



— 8. Section of a portion of a young specimen in the upper part of the hyposnlcus, to shew that 



the directive mesenteries exhibit the same arrangement of the musculature as the rest of 

 the mesenteries. 



— 9. Section of filament in the ciliated tract region a little below the stomatodaeum. 



— 10. Part of a mesentery with a craspedion. 



— II. » » » » » at the aboral end of the animal. 



