216 THE AUSTRALIAN HYDROMEDUSSE, 



The Polypomedusee form in my classification the second classis 

 of the subtype Cnidaria (1), (Claus) of the Coelenterata, and 

 comprise all polypiform and Medusiform animals. I have selected 

 this name for the Hydromedusse of Claus (2), and given the 

 reasons for doing so in my preliminary report (3). Since then I 

 have received Claus's Lehrbuch of Zoology (4), and I find that 

 Claus also has adopted in the latter publication this term, which I 

 had found independently to be the most expressive. 



The Polypomedusae as a classis are devided into the three 

 ordines Hydromedusa? (Hydroidea Claus, Hydromedusse Weis- 

 ma?in), Syphonophora and Scyphomedusal (Ray Lankaster, Acras- 

 paedse Gegenbaur, Haeckel.) 



Our Ordo Hydromedusse is, as mentioned above, to be divided 

 into four suborders. The relative value of these classificatory 

 terms is elucidated in the following table : — 



Type Coelenterata. 



1. Subtype Spongise. 



2. Subtype Cuidaria. 



Subtype Cuidaria. 



1. Classis Anthozoa. 



2. Classis Polypomedusse. 



3. Classis Ctenophorse. 



Classis Polypomedusae. 



A , n ( 1. Ordo Hydromedusa?. 

 Aphacellse < J 



( 2. Ordo Syphonophora. 



Phacellotse 3. Ordo Scyphornedusse. 



(].) Marshall has objected in a recent publication (Die Ontogenie von 

 Reniera filigrana, Zeitschrift fiir wiss. Zool. Band XXXVII.) to this term 

 on the ground that it "den Begriff nicht deckt " (I.e. Seite 243 Anmer- 

 kung), I don't see what advantage would be gained in altering Claus's 

 generally adopted term in this case. 



(2.) C. Claus. Grundziige der Zoologie, 4te Auflage, Seite 243. 



(3.) JR. v. Lendenfeld. Das System der Hydromedusen. Zoologischer 

 Anzeiger, Band VI., 18S4. 



(4.) C. Claus. Lehrbuch der Zoologie 1883, Seite 306. 



