630 



MBDUSiE OF THK WOUI.D. 



The comparative dimensions and other details are stated in the table giving a synopsis 

 of the species of Aurtllia. 



In its cleft, velar lobes it recalls A. lahiata, while in its wide, curtain-like mouth-arms it 

 stands alone among Aurellias. Indeed its peculiar mouth-curtains are all that separate it from 

 A. lahiata. 



Genus AUROSA Haeckel, 1880. 



Aurosa, Haeckkl, 1880, Sysl. dcr Mcdusen, p. 559. 



The type species and only known form is Aurosa jurcata Haeckel, from the tropical 

 Indian Ocean. 



GENERIC CHARACTKRS. 



TIk- medusa is smiilar to Aiiitllia but the 4 mouth-arms are bifurcated at their outer 

 ends. There are 2+ anastomosing radial-canals and a marginal ring-canal. 4 interradial 

 gonads, 8 rhopalia, 8 velar lobes, and numerous small tentacles as in Aurellia. 



Aurosa furcata Haeckel. 

 Aurosa jurcata, Haeckel, 1880, Syst. dcr Medusrn, p. 559, taf. ^^, fign. 7, 8. 



Bell flat, shield-shaped, 80 mm. wulc, 30 mm. high, 8 velar lappets as in Aurillia aiirita. 

 8 marginal sense-organs. Tentacles small, numerous, arising from exumbrella side of margin 



Fig. ^00.— Aurosa furcata, after Haeckel, in Das Syst. dcr Mcduscn. 



as in A. aurita. Gonads as in //. nurita. Genital radius half the bell-radius. Central stomach 

 gives rise to 24 radial-canals, all of which give forth anastomosing side-branches. There 

 are 4 perradial, 4 interradial, and 16 adradial canals. Thus each genital pouch gives rise to 

 5 radial-canals, and the perradial canals arise from the angles between the genital pouches. 

 The peripheral network of anastomosing canals becomes narrower in its mesh the nearer 

 the vessels are to the marginal ring-canal. The 4 mouth-arms resemble those of AurcUia 

 aurita, but each one bifurcates near its outer end. Their curtain-like margins are much 

 folded. 



Found near Cocos Islands, Indian Ocean, southwest of Sumatra. 



