984 ADDENDA TO THE AUSTRALIAN HYDROMEDUSiE. 



ADDENDA TO THE AUSTRALIAN HYDROMEDUS^E. 



No. II. 

 By R. von Lendenfeld, Ph.D. 



I have lately examined some specimens of Hydroid polyps, and 

 find that a few alterations are necessary in my classification. 



1. The Genera Camnanularia, Halecium and Sertularia should 

 be placed in the Subordo Hydromedusinte. Family Campanulinidse 



2. The identity of Plumularia effusa, Busk, and Acanthella 

 effusa, Allman, which has been stated by All man. (Report on 

 the Hydroida of the Challenger. Part L, Plumularidae), has not 

 been accepted by me formerly. The differences between the two 

 are however not of such valid a chai-acter as I had supposed, and 

 we must therefore unite these two. I retain Allman's name, and 

 eliminate the Plumularia effusa of Busk. 



3. The Genus Azygoplon, Allman, is identical with Halicor- 

 nopsis, Bale, and the name has to give way to the latter, which 

 has the priority. Allman's Azygoplon rostratum, (Report on the 

 Challenger Hydroida), must therefore be named Halicornopsis 

 rostratum. Von Lendenfeld. 



4. Campanularia simplex (Bale), Laomedea simplex, Lamouroux, 

 has been omitted in the list, and must be placed in the genus to 

 which Bale refers it. 



5. I find that Sei-tularia divaricata, de Lamarck, is not identical 

 with Sertularia rigicla, Lamouroux, as de Lamarck and Bale 

 supposed, and therefore add it to the list of Sertularians. 



6. T. Hutton named a Sertularella, (Sertularella polyzonias, 

 Lin.) Sertularia simplex (Transactions of the New Zealand Insti- 

 tute, Vol. V.) This is not similar to Sertularia simplex, von Len- 

 denfeld. (Addenda to the Australian Hydromedus*. Pro- 

 ceedings of this Society, Vol. IX.) 



