PLATE XXVI a. 



Fig. 



1. Spermatozoa of Harmothoe imbricata. X Zeiss, 1 oc, D obj. 



2. Spermatozoa of Lepidonotus squamatus. X idem. 



3. Trochospheres of H. imbricata assuming a greenish hue. Magnified. 



4. View of a more advanced trochosphere of March 28th, with the projecting mouth to 



the left. X 116. 

 5 and 6. Lateral and dorsal views of other examples. X 52. 



7. More advanced larva with traces of feet, but without bristles, or with such only 



indicated. 



8. A further stage in which the feet have minute bristles. (June 26th.) X 82. 



9. Larval Polyno'e with well-marked feet and bristles, minute scales, and anal cirri. 



X 52. 



10. Nectochaete stage of Harmothoe. (April 20th.) x 52. 



11. Nectochaete stage of a Polynoid (June 28th), with median and lateral tentacles and 



anal cirri. X 52. 



12. Nectochaete stage of Harmothoe, sp. (April 27th.) X 50. 



13. Nectochaete stage of Polyno'e, sp. (July 18th.) -^ inch long, x 50. 



14. More advanced nectochaete conditions in a form approaching Lagisca or Evarne. 



(October 25th.) x about 40. 



15. Dorsal view (in spirit) of nectochaete stage of a form approaching Lepidonotus 



squamatus. (June.) x 40. 



16. Ventral view of the foregoing. Similarly magnified. 



17. A slightly later stage. Similarly enlarged. 



18. Stage with developing palpi, and with additional eye-spots. Similarly magnified. 



19. Stage of the same form with distinct palpi, median and lateral tentacles, x about 35. 



20. Dorsal view of Panthalis (Erstedi, from a figure kindly sent by Mr. Arnold Watson. 



21. Proboscis and jaws of Sthenelais boa. Enlarged under a lens. 



22. Metatroch stage of Sthenelais or Sigalion seen from above. (October 22nd.) X 50. 



23. Post-larval Sigalion, pelagic condition. (October 28th.) x 50. 



24. Dorsal view of Pholo'e minuta. Enlarged. 



25. Spermatozoa of Pholo'e minuta. (June 24th.) X 350. 



