Plate 11. * 



Pacliycerianthus muUiplicatus. 



Fig. I. The second protomesentery (P. 2) x I'/a. 



— 2. The third protomesentery (P. 3) x I'/a- 



— 3. The second (sterile) metamesentery x i'^- 



— 4. The third (fertile) metamesentery x V-ji. 



— 5. the fourth (sterile) metamesentery x i^z- 



— 6. The fifth (fertile) metamesentery (first metamesentery in the second quartette) x I'/z- 



— 7. Part of a mesentery with craspedonemes. 



— 8. / » > » > at their lowest extremity. 



The very slight cnido-glandular tracts on the metamesenteries of the first and second cycles 

 (figs. 4, 6) are not shewn in those figures, nor in fig. 8. 



