590 THE AUSTRALIAN HYDROMEDUSJE, 



two in each bunch. Ocellar bulbs scrota-shaped, very large about 

 half the size of the stomach. The number of tentacles in each 

 bunch increases to five, so that the adult animal possesses twenty 

 tentacles. These are about half as long as the Umbrella is high. 



The Medusa multiplies at every stage rapidly by forming 

 numerous buds at the base of the Manubrium. These buds are 

 prolific when they are born. They show traces of buds even 

 before. Mesenterial pouches are present as in Sarsia. 



Colour : Ocellar bulbs and stomach brown. Medusa otherwise 

 colourless. 



Size: Height of Umbrella, 3 mm. Breadth, 2 5 mm. 



Ontogenesis and Polyj) colonies unknown. 



Note : I found a good many of the young stages of this Medusa 

 one morning in a glass containing Hydroids. In searching for the 

 Polyp colonies, from which these Medusa) were probably produced, 

 I only found Endendrium pusillum without traces of Medusa- 

 buds, a Syncoryne and Obelia geniculata. It is just possible that 

 our Medusse budded on the Syncoryne, in which case it would be 

 necessary to refer the species to another subfamily (together with 

 Stauridium). As the Medusa multiplies rapidly by producing 

 buds at every stage of its development, it is not unlikely that the 

 numerous Medusae in my Aquarium were produced in this way 

 from one or two which had been in the water. 



Locality ; Port Jackson. 



Season : April and March. 



39. GENUS LIMNOREA. Peron et Leseur. 



The Medusa? are Margelida? with branched or otherwise com- 

 plicated moutharms (styles), and with numerous tentacles which 

 are not situated in bunches. (16-32 or more.) 



Polyp colonies unknown. 



