BY R. VON LENDENFELD, PH.D. 599 



III. SUB- FAMILY ATRACTYLUSLE. 



The Polypes possess a single verticil of filiform tentacles. The 

 Medusoid buds are produced on the Hydrocaulus. 



No Australian representatives of this Subfamily are known. 



II. FAMILY LEPTOMEDUSID,^. Von Lendenfeld, 1884. 



LEPTOMEDUS^E. Haeckel. 



Medusea with Ocelli or Ectodermal Otolithes and Gonads, 

 developed in the walls of the Radial Canals 



Meduste always budding on transformed Polyps, Polypostyles 

 and never on the alimentary Zooids. 



Alimentary Zooids and Poh postyles invested by a chitinous 

 Perisarc, and possessing one verticil of filiform tentacles with the 

 exception of Campanopsis. Claus (1.) 



I. SUB-FAMILY THAUMANTINA. 

 THAUMANTID^E. Gegenbaur. 

 Leptomedusse without marginal vesicles, simple Radial Canals. 

 Polyp colonies similar to Lafoea (2.) 



45. GENUS DISSONEMA. Haeckel. 



Tkaumantias with four Gonads along the four Radial Canals, two 

 opposite perradial tentacles. No marginal clubs or cirrhi. Polyp 

 colonies unknown. 



197. DISSONEMA SAPHENELLA. Haeckel. 



This species has been obtained from Australia and described by 

 Haeckel (1.) 



(1) C. Claus. Eucopidenentwickelung etc. Arbeiten Zool. Inst Wien, 

 Band IV. Seite 89. 



(2) L. Agassiz. North American Acalephas. Contrib. Nat. Hist , U.S.A. 

 Vol. IV., p. 124. 



