BY R. VON LENDENFELD, Pn.D. 917 



are connected by one thick fibre with the supporting lamella or 

 gallert, and by a thin fibril, probably with the Sub-epithelial 

 plexus of ganglia cells. 



This hypothesis [ tried to prove by additional facts (1) 

 published in another paper. 



Korotneff has recently (2) found a similar structure in the 

 nettle-bulb of Praya, where, besides the thick peduncles, which 

 he considers as muscular, fine and gvanulose Nerve-fibres are 

 described, connecting the Cnidoblast with a Ganglia cell. 



Although working at the unparalleled Zoological Station at 

 Naples he is apparently unacquainted with my discovery, pub- 

 lished in the papers mentioned above a year previously, he 

 describes the same thing which I have discovered. He has, how- 

 ever, not been led to the very simple conclusion which I drew 

 from the fact, and overlooks the great importance of it concerning 

 the physiology of Thread-cells altogether. 



The stomach of our Medusa is slender, and about half as long 

 as the Umbrella. The Mesenteria which connect it with the 

 Radial Canals are inconspicuous and transparent. The Gonads are 

 four longitudinal, narrow folds, with smooth surface. There are 

 four small lips to the mouth. 



Size : Height of Umbrella, 3 mm. Breadth, 2mm. 



Colour : Umbrella, light pink. The nettle-lines more intensely 

 coloured. Stomach and tentacle-bulbs light brown. 



Locality : Port Jackson. 



Season : Spring, August, September. 



III. SUB-FAMILY MARGELIN^. 



40a (73). GENUS. MARGELIS. Steenstrup. 



Margelinaa, with ramified or composite mouthstyles, and with 

 four perradial bundles of tentacles. Stomach small, without 

 peduncle, with narrow basis attached to the point, where the 



(1.) V. Lendenfeld. Zur Eistologie der Actinien. Zoologischer Anzeiger. 

 Band YI. Seite 189. 



(2.) A. Korotneff. Zur Histologie der Siphonophoren. Mittheilungen 

 der Zoologischen Station in Neapel. Band V. Seite 264. Tafel 18. 

 Fig 80. 



