230 THE AUSTRALIAN HYDROHEDUS.E, 



Gemmaria. McCrady. 

 Eleutheria. Quatrefages. 

 Ctenavia. Haeckel. 

 Cladonema. Diyardin. 

 Dendronema. Haeckel. 

 Heterostephanus. Allman ? 



10. FAMILY TUBULARLD^E. Von Lendenfeld, 1884. 

 The Medusas in tins family become more or less rudimentary, 

 and remain attacked to the Polypes. 



All Zooids are alike and all bear Medusae. 



SCHEMA. 

 Ovum 



Medusoid bud 



I 

 Polyp 



I 

 Hydrorhiza 



I 

 First Polyp 



I 

 Ovum 



I. SUB-FAMILY. PENNARIN^E. 

 The Polypes possess a distal set of capitate and a proximal set 

 of filiform tentacles. 



Pennaria. Goldfuss. 

 Halocordyle. Allman. 

 Monocaulus Sars 1 



II. SUB-FAMILY. TUBULARIN.E. 

 The Polypes possess two verticils of filiform tentacles. 

 Tubularia. Allman. 



III. SUB-FAMILY. ATRACTYLIN.E. 

 The Polypes possess a single verticil of filiform tentacles. The 

 medusoid buds are produced on the Uydrocaulus. 

 Atractvlis. Hincks. 



