AUSTRALIAN HYDROMEDUS.E. 31 



129. Pentandra parvula. V. Lendenfeld. (88) 355, (94)489. 

 South coast of Australia (Western Port, Bass' Straits). 



130. Pentandra Balei. V. Lendenfeld. (97) 490. 

 North coast of Australia (Torres Straits). 



VIII. Familia DICORYNIDJE. Allman, 1872. 



Generative zooids free swimming polyps, with two tentacles, and without 

 a mouth, carrying two ova each. These zooids bud only on polypostyles, and 

 never on the alimentary zooids, which have one verticil of filiform tentacles. 



30. Genus DICORYNE. Allman, 1872. 



Hydrocaulus, consisting of branches or simple stems, which arise at intervals 

 from a creeping filiform hydrorhiza. Alimentary zooids fusiform, with a 

 single verticil of filiform tentacles surrounding the base of a conical hypos- 

 torn. 



131. Dicoryne annulata. V. Lendenfeld. (94) 491. 

 South coast of Australia (Port Phillip). 



II. SUB-OEDO.-HYDEOMEDUSIN^E. 



V. Lendenfeld, 1884. 



Colonies of polymorphic zooids. The alimentary zooids retain the shape 

 of polyps, whilst those in which the sexual pi-oducts reach maturity are 

 medusa^, which may become free, or remain attached to the colony, and 

 become rudimentary and form medusostyles (4), (20), (29), (30), (50), (54), 

 (57), (58), (59), (65), (87), (130), (131). 



IX. Familia ANTHOMEDUSIDJE. V. Lendenfeld, 

 : ANTHOMEDUSIDJE. Haeckel, without the Cytseidaj of Hacckel. 



Medusa become free, without otoliths, with acelli at the base of tentacles. 

 Gonads in the wall of the gastral cavity. The alimentary polyps are not 

 invested by chitinous cups. The medusae bud mostly on the ordinary ali- 

 mentary polyps, exceptionally they are also born on peduncles, and bud 

 direct from the hydrorhiza. Mouthless generatio polyps. Polypostyles do 

 not occur. 



I. Sub-familia CODONINJE. V. Lendenfeld, 1884. 

 CODONIDJE. Haeckel. 



Mouth simple. Gonade a simple tube. Four radial canals and unbranrhcd 

 tentacles, which are scattered, or in two verticils. The medusa? bud on the 

 polyps between the tentacles. 



* 



31. Genus SARSIA. Lesson. 



Codonidse, with four equal tentacles. Membrane often very long, never 

 cubic. Umbrella without cap on the vortex. Exumbrella smooth, without 

 projecting nettlework. Polyps club-shaped, with scattered capitate tentacles. 

 (54) 525, (96) (97) (125) (131) 55 



