BY R. VON LENDENFELD, PH.D. 919 



11. FAMILY. LEPTOMEDUSID^. Von Lendenfeld. 



I. SUB-FAMILY. THAU.VIANTIN.E. 

 46a (74.) GENUS. OCTORHOPALON (1.) Nov. gen. 



Thamantinte with four Radial Canals and four Gonads, eight 

 tentacles, and eight clubs, in the intervals between the tentacles 

 one in each Octant. 



This new Genus belongs to Haeckel's Sub-Family Laodicidee (2), 

 and appears very nearly related to his Genus Octonema, from 

 which it differs by the absence of Cirrhi, and by the small number 

 (8) of the marginal clubs. 



197a (238), OCTORHOPALON FERTILIS. Nov. spec. 

 Plate XLIL, figs. 14-15. 



Umbrella semiovate, much higher than broad. Stomach repre- 

 senting a double four-sided Pyramid, Octeedral, widest in the 

 middle. Tips of the mouth produced into four inconspicuous 

 extensions at the corners. Intervening parts of the margin 

 concave. Gonads very large and extending all about the Radial 

 Canals. The four Gonads are joined around the stomach. They 

 are richly folded transversely. 



The tentacles about two-thirds of the length of the Umbrella. 

 The perraclial ones longer than the interradial ones. The bulbs at 

 the bases of the tentacles not large, elongate. The clubs 

 large, elongate-oval, a little longer than the tentacle bulbs. 



Colour ; Gonads reach orange yellow. Medusae otherwise 

 colourless. 



Size : Height of Umbrella, 2*5 mm., breadth, 2 mm. 



Ontogenesis : Unknown. 



Locality : Port Jackson. 



Season : Early spring. 



(1.) oktco, eight ; s'onaXov, a club. 



(2.) Haeckel. Das System der Medusen. Seite 125. 



