174 



EXPEDITION OF THE "ALBATROSS," 1899-1900. 



PLATE 5. 



Fig. 21. Jihopalonema typicum = Homceo- 

 nerna typicum Maas. 

 " 22. Rhopalonema typicum. 



" 23. Solmissus marshalli, sp. nov. 

 " 24. " " 



" 25. " " 



Portion of "bell-margin showing the very mi- 

 nute otocysts. 

 Side view, natural size. 

 Oral view of medusa, natural size. 

 View of marginal sense organ. 



PLATE 6. 



Fig. 26. Charybdea grandis, sp. nov. 



" 27. " " 



" 28. " " 



" 29. 

 " 30. 

 " 31. 



Side view of a young medusa. 



Side view of a tentacle from a mature me- 

 dusa, natural size. 



Enlarged view of a portion of the flexible 

 part of the teutacle, showing the linear 

 arrangement of the nematocysts. 



Enlarged side view of a sense organ of a 

 mature medusa. 



Surface view of a sense organ of a young me- 

 dusa. 



Enlarged view of one of the velar canals. 



PLATE 7. 



Fig. 32. Nausithoe punctata var. pacifica 

 Agassiz and Mayer. 

 " 33. Nausithoe picta, sp. nov. Oral view of 9 medusa. 



PLATE 8. 

 Fig. 34. Pelagia tahitiana, sp. nov. 

 " 35. " " Oral view of a portion of the disk. 



" 36. Nectophysa Wyvitlei? Haeckel. 

 " 37. Diphyopsis angustata Haeckel. Terminal uematocyst-battery of a tentacle. 



PLATE 9. 



Fig. 38. Diphyopsis appendiculata. 

 " 39. " " 



" 40. Ersosa appendiculata. 



Side view of the polygastric generation. 



Side view of the siphosome, showing the order 

 of development of the the polypites, tenta- 

 cles, and bracts, (ps) Inferior swimming- 

 bell ; (as) auxiliary swimming-bell. 



The monogastric, sexual generation of 

 Diphyes appendiculata. 



