920 ADDENDA TO THE AUSTRALIAN IIYDR0MEDUS.E, 



III. SUB-FAMILY. ENCOPIN^E. 



49. GENUS. EUOOPE. Gegenbaur. 

 201a (239). EUCOPE HYALINA. Nov. Spec. 

 Plate XLIL, Figs. 16, 17, 18. 



Umbrella flat, nearly watch-glass shaped, more than twice as 

 broad as high. Gallert in the centre, exceptionally thick. The 

 stomach half as long as the Umbrella is high and a little broader 

 than long. Margin exteuded, with irregular small flaps. The 

 4 Gonads are oval and grow out from the distal third of the four 

 Radial Canals. Eight tentacles about as long as the Umbrella is 

 high with conic basal tentacle bulbs. Eight adradial large 

 vesicles. There are always three Otolithes on each vesicle. The 

 vesicles (Fig. 18) are spherical and attached to the cushion of 

 elongated sensitive cells with long cilice by a broad and short 

 peduncle 



Colour : Medusa extremely transparent. Gonads and stomach 

 pale yellow. 



Size : Diameter of Umbrella 6 mm. ; height 3 mm. 



Ontogenesis : Unknown. I have found numerous different 

 species of Campanularians which have not been decribed, because 

 their Gonophores were not seen. There is no one of these more 

 likely than any other, to be the Polypcolony belonging to our 

 Eucope. 



Locality : Port Jackson. 



Season : Early spring. 



50. GENUS. OBELTA. Peron et Leseur. 



203. OBELIA AUSTRALIS. Von Lendenfeld. 



Plate XLIIL, Figs. 19, 20, 21, 22. 



1(1) have described this species from the Polypcolonies and 

 the young larvre, which I obtained in Port Jackson. Since then 

 I have obtained the adult Medusa, apparently belonging to this 



(1.) Von Li'wlenfeld. The Australian Hydromedusae. Part V. Pro- 

 ceedings of the Linnean Society of N.S.W., Vol. IX., p. 604. 



