22 DESCRIPTIVE CATALOGUE OF THE 



Colour. Ovaries, canals, and tentacles rose coloured. 



Size. Breadth of umbrella, 80-100 mm. ; height, 40-. r >0 mm. 



Locality. South Pacific Ocean, Port Praslin, New Ireland, Lesson ; New 

 Zealand, Australia (?) Peron. 



AURELIA C.ERULEA, R. von Lendenfekl. 



Anrelia ccerulea, R. v. Lendenfeld. The Scyphomedusse of the Southern 

 Hemisphere. Proceedings of the Linnean Society of New South Wales ; 

 volume ix, part 2, page 280. 



The umbrella is very flat, about 5 times as broad as high, with 1C small 

 ocular and 1G velar flaps, divided from the former by deep incisions, but from 

 each other only by a shallow groove. The mouth-arms are broad and a little 

 longer than the margin of the umbrella. They are rounded at the end. The 

 centrifugal branches of the canal system divide at larger angles than in other 

 species, so that the ramification has by no means a slender appearance. There 

 are very few anastomoses only. 



It differs from Aurelia aurita (Lamarck) by its broad mouth-arms, the 

 margins of which are not curled, and by the stubby appearance of the canal 

 system. In these respects Aurelia colpota (Brandt) resembles Aurelia crerulea. 

 The colour of our species is similar to that of Aurelia aurita, but fainter, and 

 always decidedly blue. Aurelia colorata also differs from our species in colour. 

 Aurelia flavidula (Peron et Lesueur) possess flaps at the base of the mouth- 

 arms, and has a yellow tinge. Aurelia marginalia (L. Agassiz) has much 

 smaller mouth-arms. Aurelia hyalina (Brandt), again, possesses lancet-shaped 

 mouth-arms. Aurelia labiata (Chamisso et Eysenhardt) possesses 1C velar flaps 

 like our species, but these are divided from each other by deep incisions. In 

 Aurelia clausa (Lesson) the mouth-arms are narrow and curled, and the colour 

 is red. In Anrelia limbata (Brandt) there also are 16 very distinct velar 

 flaps, and the tentacles are brown. 



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

 advisable to distinguish Aurelia cserulea 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 European Aurelias, we may suppose that 

 the Ontogenesis of our species is similar to that of Aurelia aurita. 



Locality. Port Jackson, von Lendenfeld. 



