G02 THE AUSTRALIAN HYDROMEDUS^, 



48. GENUS EUCOPE. Gegenbaur. 



Eucopinae with eight marginal vesicles, 8 tentacles, no marginal 

 cirrhi, no stalk to the stomach and four Gonads in the four Radial 

 Canals. The Polypcolonies consist of much branched stems 

 growing up from a creeping Hydrorhiza. 



201. EUCOPE ANNULATA. nov. sp. 

 Plate XXVIII., figs. 53-57. 



The Medusa. 



Umbrella semiovate slightly higher than broad. Manubrium 

 quadrangular prismatic wider at the mouth end with a slight 

 constriction in the lower third. Connected with the Umbrella by 

 a narrow neck. About a third as long as the Umbrella-cavity. 

 Mouth without flaps, four cornered, the corners slightly projecting. 

 Gonads oval in the distal third of the Radial Canals about a quarter 

 of their length. Tentacles very short and thick about as long as a 

 third of the height of the Umbrella. Basal bulb not very con- 

 spicuous. 



The marginal vesicles contain generally two Otoliths. 



Irregular Medusae with five Radial Canals were very frequent 

 and in those there were also five tentacles present. The pentameral 

 form originates by one Radial Canal branching dichotomously in a 

 greater or smaller distance from the central stomach. 



Colour : Medusa colourless. Gonads bight yellow. 



Size : Height of Umbrella, 2-5 mm. ; breadth, 2 mm. 



The Polyp Colony. 



From a creeping reticulate anastomosing Hydrorhiza stems rise 

 up which are much branched, all branches diverge at small angles, 

 so that thecolony attains the shape of a populus pyramidalis. 

 The branches are annulated throughout, but the transverse incisions 

 are deeper near the base than near the Hydranths. 



