LIST OF THE WOOD-CUTS. 



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



PAGE 



Fig. 1. Young BoLiNA alata, seen from the narrow side 15 



" 2. Bolina in state of Fig. 1, seen from the broad side . . . . . . 16 



" 3. Somewhat younger than Fig. 1, seen from the abactinal pole . . . . .16 



" 4. Young Bolina, seen from the abactinal pole, older than previous figures . . 16 



" 5. Formation of lateral tubes in young Bolina . . . . . . . .16 



" 6. Bolina in which lobes begin to appear, seen from the narrow side, same state as Fig. 4 16 



" 7. Somewhat more advanced than Fig. 6, seen from the actinal side . . . .16 



" 8. The tentacular ambulacra have united, and the lobes project well beyond the open- 

 ing of the mouth . ...... . . . . .17 



" 9. About in the condition of Fig. 1, seen from the broad side 17 



" 10. Somewhat younger than Fig. 8, seen from the broad side 17 



" 11. Fig. 8, seen from the broad side 17 



" 12. Bolina showing first appearance of the auricles, seen from the broad side . . .17 



" 13. Bolina in stage of Fig. 1 2, seen from the narrow side . . . . . . 17 



" 14. Fig. 13, seen from the actinal pole 18 



" 15. Adult Bolina, seen from the broad side. (L. Agassiz.) 18 



" 16. Fig. 15, seen from the narrow side. (L. Agassiz.) ....... 18 



" 17. Bolina, seen from the actinal pole. (L. Agassiz.) ....... 18 



" 18. Bolina, seen from the abactinal pole. (L. Agassiz.) ....... 18 



" 19. BoLixA viTREA, seen from the broad side. (L. Agassiz.) 19 



" 20. Mnemiopsis Gardeni, seen from the broad side. (L. Agassiz.) . . . .20 



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



" 22. Mnemiopsis Leidyi, seen from the broad side 21 



" 28. Same as Fig. 22, seen from the narrow side 21 



" 24. A part of the tentacular apparatus near the opening of the actinostome . . .22 



" 25. Lesueuria hyboptera, seen from the broad side 24 



" 26. Fig. 25, seen from the naiTOw side .......... 24 



" 27. The same, seen from the abactinal pole ......... 25 



" 28. Seen from the actinal pole . . . . . . . . . ... .25 



" 29. Adult Mertensia ovum, seen from the broad side ...... 27 



" 30. Young Mertensia, seen from the broad side . . 27 



" 31. Fig. 30, seen from the abactinal pole ......... 27 



" 32. Somewhat more advanced Mertensia, seen from the narrow side . . . .28 



" 33. Same as Fig. 32, seen from the actinal pole 28 



" 34. Still more advanced Mertensia, seen from the narrow side . . . ... 28 



" 35. Fig. 34, seen from the actinal pole .......... 28 



" 36. Still further advanced Mertensia, seen from the broad side 29 



" 37. Young Mertensia, about in the same condition as that of the preceding figure, seen 



from the nan-ow side ........... 29 



" 38. Young Pleurobrachia rhododactyla, seen from the broad side ... 30 



" 39. Same as Fig. 38, seen from the narrow side 30 



" 40. Same as Fig. 38, seen from below 30 



" 41. Somewhat more advanced, seen from the broad side ....... 30 



