LIST OF THE WOOD-CUTS. 



[Note. — Unless otherwise credited, the Figures are drawn from nature by Alex. Agassiz.] 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 Ifl. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 

 25. 

 26. 

 27. 

 28. 

 29. 

 30. 

 31. 

 32. 

 33. 

 34. 

 35. 

 36. 

 37. 



38. 

 39. 

 40. 

 41. 



Young BoLiNA ALATA, seen from the narrow side 



Bolina in state of Fig. 1 , seen from the broad side 



Somewhat younger than Fig. 1, seen from the abactinal pole 



Young Bolina, seen from the abactinal pole, older than previous figures 



Formation of lateral tubes in young Bolina 



Bolina in which lobes begin to appear, seen from the narrow side, same state as 



Somewhat more advanced than Fig. 6, seen from the actinal side 



The tentacular ambulacra have imited, and the lobes project well beyond the 



ing of the mouth 



About in the condition of Fig. 1, seen from the broad side .... 



Somewhat younger than Fig. 8, seen from the broad side .... 



Fig. 8, seen from the broad side ......... 



Bolina showing first appearance of the auricles, seen from the broad side . 



Bolina in stage of Fig. 1 2, seen from the narrow side 



Fig. 13, seen from the actinal pole 



Adult Bolina, seen from the broad side. (L. Agassiz.) . 

 Fig. 15, seen from the narrow side. (L. Agassiz.) . 

 Bolina, seen from the actinal pole. (L. Agassiz.) . . . , 

 Bolina, seen from the abactinal pole. (L. Agassiz.) . 

 Bolina vitrea, seen from the broad side. (L. Agassiz.) . 

 IMxEMiOPSis Gardeni, seen from the broad side. (L. Agassiz.) 

 Fig. 20, seen from the actinal pole. (L. Agassiz.) 

 MxEMioPSis Leidyi, seen from the broad side .... 



Same as Fig. 22, seen from the narrow side 



A part of the tentacular apparatus near the opening of the actinostome 

 Lesueuria hyboptera, seen from the broad side .... 



Fig. 25, seen from the narrow side ....... 



The same, seen from the abactinal pole ....... 



Seen from the actinal pole ......... 



Adult Mertensia ovum, seen from the broad side .... 



Young Mertensia, seen from the broad side . « . . . 



Fig. 30, seen from the abactinal pole 



Somewhat more advanced Mertensia, seen from the narrow side 



Same as Fig, 32, seen from the actinal pole 



Still more advanced Mertensia, seen from the narrow side . 



Fig. 34, seen from the actinal pole ....... 



Still further advanced Mertensia, seen from the broad side 



Young Mertensia, about in the same condition as that of the preceding figure 



from the narrow side ........ 



Young Pleurobrachia rhododactyla, seen from the broad side 



Same as Fig. 38, seen from the narrow side 



Same as Fig. 38, seen from below ....... 



Somewhat more advanced, seen from the broad side . 



Fi2:.4 



open- 



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