Plate II. 



Pachycerianthus multiplicatus. 

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



2. The third protomesentery (P. 3) x i'/2- 



3. The second (sterile) metamesentery x i l / 2 . 



4. The third (fertile) metamesentery x i 1 /^. 



5. the fourth (sterile) metamesentery x i l / 2 - 



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. 



