BY R. VON LENDENFELD, PH.D. 281 



Similar in appearance, to one or other of these species, it still 

 appears advisable to distinguish Aurelia coerulea from these. 

 The main feature of our species are the broad and smooth mouth- 

 arms. 



Colour : Transparent and blue. Only the hoof-shaped Gonads 

 reflect the light, and appear white or light rose-coloured as in 

 Aurelia aurita. 



Size : Diameter of Umbrella, 110 mm. Height, 20-30 mm. 



Ontogenesis : I have obtained a single Larva measuring 9 mm, 

 this being similar to corresponding stages in Europseon Aurelias, 

 we may suppose that the Ontogenesis of our species is similar to 

 that of Aurelia aurita. 



Locality : Port Jackson. Von Lendenfeld. 



Genus. Aurosa. 



Ulruaridse, with 8 marginal bodies, and 8 broad adradial 

 velar-flaps, each of which bears at its upper side, a little distance 

 from the margin of the Umbrella, a row of numerous short 

 tentacles alternating with the same number of much smaller 

 dorsal flaps. Mouth-arms dichotomous. 



Species. Aurosa furcata 



Haeckel, System der Medusen. Seite, 559. 



Umbrella flat, orbicular. The 8 velar-flaps of the margin of 

 the Umbrella slightly pi'ojecting, divided by small ocular-pouches. 

 Mouth-arms a little longer than the Umbrella radius, very thick. 

 Divided into two lobes by a deep incision in their distal part. 

 Very much cmded at the margin. Umbrella radius twice as long 

 as the genital radius. At every genital bay five canal roots con- 

 nected with each other, and with the four perradial ocular canals 

 by numerous Anastomoses. Canal-net dense with rounded meshes, 

 which are half as large in the outer than in the inner zone. 



Size : Diameter of Umbrella, 80 mm. Height, 30 mm. 



Locality : Indian Ocean, Cocos Islands. Rabbe. 



