MEDUS.E. 175 



PLATE 10. 



¥ig. 41. JSrscea angvstata, sp. nov. The monogastric sexual generation of Diphy- 



opsis angustata. 



'• 42. Diphijo2)sis angustata Haeckel. Enlarged view of one of the units upon the 



siphosome. (h) Immature swimming-bell ; 

 (c) covering-scale; {p) polypite ; (««) sipho- 

 some; {t) tentacle. 



•' 43. Physalia utrlculus Eschscholtz. Young individual 2 mm. in length ; with pri- 

 mary polypite and tentacle. 



" 44. " " " Young individual 4 mm. in length; with sec- 



ondary tentacle and polypite. 



" 45. Aglaisma quincunx Mayer. The monogastric sexual generation of Abyla 



quincunx. 



PLATE 11. 



Fig. 46. Abijla qiiinciinx Chun. Specimen obtained at Suva, Fiji. 



" 47. " " " Terminal nematocyst-battery of a tentacle. 



" 48. Abijla Huxleyi^^ Calpe Haxleiji 

 Ilaeckel. 



PLATE 12. 



The entire animal. 



Side view of the hoat. 



Side view of a swimming-bell. 



A gonostyle. $ male, 9 female gonophores. 



A feeding polypite. 



Side view of one of the terminal nematocyst- 

 batteries of the tentacles. 



Side view of an immature bract. 



View looking down on a mature bract, show- 

 ing the upper surface. 



Lower surface of a mature bract. 



PLATE 13. 



Fig. 58. Pleurohrachia ochracea, sp. nov. 

 " 59. Lampetia fusiforiiiis, sp. nov. 

 " GO. " " Side view of apical sense organ. 



PLATE 14. 



Track of the " Albatross." 



