(WO 



MEDUSA OF THE WORLD. 



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

 of the species of Aurellia. 



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

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

 ./. liilnata. 



Genus AUROSA Haeckel, 1880. 



Aurosa, HAECKEL, 1880, Syst. tier Medusen, p. 559. 



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

 Indian Ocean. 



GENERIC CHARACTERS. 



The medusa is similar to Aurellia but the 4 mouth-arms are bifurcated at their outer 

 ends. There are 24 anastomosing radial-canals and a marginal ring-canal. 4 mterradial 

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



Aurosa furcata Haeckel. 



Aurosa jurcala, HAECKEL, 1880, Syst. der Medusen, p. 559, taf. 33, fign. 7, 8. 



Bell flat, shield-shaped, 80 mm. wide, 30 mm. high, 8 velar lappets as in Aurellia aunta. 

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



FIG. 400. Aurosa jurcala, after Haeckel, in Das Syst. der Medusen. 



as in A. aunta. Gonads as in A. aurita. 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 Aurellia 

 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. 



