BY DR. R. VON LENDENFELD. 231 



11. FAMILY LEPTOMEDUSID^E. Von Lendenfeld, 1884. 

 LEPTOMEDUS.E. Haeckel. 

 Medusea with Ocelli or Ectodermal Otolithes and Gonads, 

 developed in the walls of the Radial Canals. 



Medusae always budding on transformed Polypes, Polypostyls 

 and never on the alimentary Zooids. 



Alimentary Zooids and Polypostyles invested by a chitinous 

 Perisarc. 



SCHEMA : 



Ovum 



I 

 Medusa 



Polyp Polypostyl 



V 



Hydrohiza 



I 

 First Polyp 



Ovum. 



I. SUB-FAMILY THAUMANTINA. 

 THAUMUANT1D.E. Gegenbaur. 

 Leptomedusa? without marginal vesicles, simple Ptadial Canals. 

 Tetranema. Haeckel. 

 Dissonema. Haeckel. 

 Octonema. Haeckel. 

 Thaumtias. Eschscholtz. 

 Staurostoma. Haeckel. 

 Laodice. Lesson. 

 Melicertella. Haeckel. 

 Melicertissa. Haeckel. 

 Melicertum. A. Agassiz. 

 Melicertidium. Haeckel. 

 Orchistoma. Haeckel. 

 16 



