

BY R. VON LENDENFELD, PH.D. 603 



The Hydranths are invested by conic, thin and transparent cups, 

 they possess a single verticil of 30-35 (mostly 32) tentacles, and a 

 wide mouth. 



The Polypostyles on which the Medusa? bud, are invested by long 

 nearly cylindrical Gonothecae. 



The Polypostyle has the shape of a simple tube, which is spread 

 out laterally at the terminal end. Numerous Medusa? bud in each 

 Gonophor. 



Colour : Perisarc light brown. The depth of colour depends on 

 the thickness of the Perisarc. Entoderm of Polypostyles dark 

 brown, in the other parts light brown. 



Size : The stems attain a height 12-16 mm. 



Ontogenesis unknown. 



Locality : Laminarian Zone, Lyttleton, New Zealand. 



Season : Gonophores produce Medusa? in June and July. 



49. GENUS OBELIA. Peron et Leseur. 



Eucopinee with eight adradial marginal vesicles and numerous 

 tentacles (12-24 or more often over two hundred.) Marginal 

 vesicles at the axial side of the base of the tentacles. No marginal 

 cirrhi, four Gonads on the four Radial Canals. Subumbrella with 

 rudimentary velum. No stalk to the stomach. 



Polyp colonies with a much branched stem and elongate 

 Gonophores. The Perisarc smooth, generally with a few transverse 

 incisions at the proximal end of each branch. 



202. OBELIA GENICULATA. Altaian. 



This cosmopolitan species has been observed on the Southern 

 Coast of Australia and on the Coast of New Zealand by Caughtrey 

 (1 .) I have observed a Hydromedusa which I am inclined to place 

 in this species in Port Jackson. This one however, differs from the 

 ones I have seen at home, but not sufficiently to make a new 

 species of it. 



