BY R. VON LENDENFELD, PH.D. 589 



of water, that is 2^ cubic meters. The surface net washed out in a 

 glass containing 1 litre of sea water (1,000 cm.), stirred up, and the 

 number of Medusae counted, which were contained in 5 cm., water 

 taken out from the glass multiplied by 200 and divided by 2*5 gave 

 the approximate number per cubic meter : 



1884— 18th March, 620. 

 5th April, 790. 

 22nd April, 510. 

 If we were to multiply these numbers with the number of tons 

 of water in Port Jackson, 1 ton=l cubic meter, we would obtain 

 numbers, which are otherwise only met with in Astronomy. 

 Season : Summer and autumn. 



III. SUB-FAMILY. MARGELIN^. 



MARGELID.E. HAECKEL, WITH THE EXCEPTION OF 

 HAECKEL'S GENERA CYTAEIS, CUBO-GASTER, DYSMOR- 

 PHOSA, CYT^ANDRA. 



Anthomedusaa, with simple or branched moutharms. Gonad 

 divided into four or eight marginal flaps. The Medusae bud on 

 Colonies of Polyps, which contain alimentary Zooids, with one 

 verticil of filiform tentacles. I do not consider Stauridium pro- 

 ductum, and its Medusa to belong to this Family. 



38. GENUS LIZUSA. Haeckel. 



The Medusae are Margelinse with simple unbranched styles round 

 the mouth, and with four perradial bundles of tentacles. The 

 Polyp colonies ai'e probably, according to Haeckel similar to 

 Eudendrium. 



184. LIZUSA PROLIFERA. nov. sp. 



Plate XXIIL, figs. 38-39. 



Umbrella semispherical or ovate higher than broad. Stomach 

 nearly cubic, small, four simple styles round the mouth, about § 

 of the length of the stomach. Tentacles of the smallest Medusae 

 39 



