310 BULLETIN OF THE MUSEUM OF COMPARATIVE ZOOLOGY. 



13. E. folkata with bell reversed. 



14. Side view of the young Epcnthesis with eight tentacles. 



15. Adidt Ectoplcura ochracea, A. Ag. 

 15 a. Magnified proboscis of the same. 



15 6. Magnified basal part of the proboscis when retracted. 



16. Youngest larva observed of E. ochracea. 



17. Youngest medusa of Phialium duodecimalc, Haeck. 



18. The same (oral view). 



19. An older stage of P. duodecimale (bell expanded). 



20. The same (oral view). 



21. The same (bell contracted). 



22. Youngest larva of Willia ornata, McCr. 



22 a. The same (oral view). 



23. Older larva of W. ornata. 



23 a. A row of three clusters of lasso-cells found on the external walls of W. ornata. 

 23 b. A single cluster of lasso-cells from the external wall of the youngest Willia 



(fig. 22). 

 23 d. Tentacular bulb of W. ornata (optical section). 



24. Willia, sp., with budding stola. 



25. Marginal sense body of Dactylometra quinquecirra, A. Ag. (The marginal 



lobes are infolded. ) 



26. The same (side view with marginal lobes extended). 



27. The relative position of the outer pit and the otocyst of the same. 



28. Portion of the bell margin of D. quinquecirra between two marginal sense 



bodies. 



29. Tentacular bulb of Eucope. 



30. Tentacular bulb of Gcmmaria gemmosa, McCr. 



31. Nectocalyx of Gleba hippopus, Forsk. 



32. The same (side view). 



33. G. hippopus with retracted stem. 



34. Calycopsis tijpa, gen. et sp. nov. 



35. Tentacular bulb of Ectopleura ochracea. 



36. Portion (terminal) of the tentacle of the last. 



37. Coveiing scale of Haliphyta magnijfca, gen. et sp. nov. 



38. Inner pits, " Riechgriibschen," of the marginal sense body of D. quinquecirra. 



39. The inner pits from above. 



40. Taster of Haliphyta inagnifica. 



41. Chromatoncma rubrum, gen. et sp. nov. 



Cambridge, April 1, 1882. 



