1(5 
Journal of the 
coming from Australia. It is somewhat remarkable that so few 
Plumulariidce have been previously recorded from this province 
by recent authors, though these beautiful forms are by no means 
rare. Only two or three Campanularians and no Athecata have 
been described, which is, however, easily accounted for by the 
delicacy of the polypary in the former, and its rudimentary con¬ 
dition in the latter, rendering the study of them difficult, except 
to those who have facilities for observing them in the fresh state. 
If these groups bear anything like the same proportion to the 
Sertularians that they do on the British coasts, any observer 
living at the sea-side, especially if provided with facilities for 
dredging, will find an extensive and almost untrodden field 
open to him in the study of these perishable forms and their 
development. 
With the object of facilitating the labours of any who may be 
disposed to enter upon the study of our Hydrozoa , I subjoin a list 
of species already described by recent authors, so far as they are 
known to me, with their synonyms and localities, and references to 
the books or papers in which they are described; and I trust to 
give, in future papers, descriptions and figures of such of these 
species as I have obtained, especially those which, like Mr. Busk’s 
species, have been briefly described but never figured. 
The following is a list of the principal authors who have pub* 
lished descriptions of Australian and New Zealand Ilydroida :— 
Lamouroux. Histoire des Poly piers Corallines Flexibles, 1816. 
Lamarck. Histoire Naturelle des Animaux sans Vertebres. 
Krauss. Beitrage Eur Kentniss der Zoophyten der Stidsee, 1832. 
Gray. Diefienbach’s “New Zealand.” 
Busk. Voyage of the “ Battlesnake,” vol. I. App* 
Busk. Sertularians and Zoophytes of South Africa. British 
Association Reports, 1850. 
Hincks. On New Australian Hydrozoa . Annals and Magazine 
of Natural History, 3rd series, vol. VII. 
Allman. New Genera and species of Ilydroida. Journal of 
the Linnean Society, Zoology, vol. XII. 
Hutton. New Zealand Sertularians. Transactions of the 
New Zealand Institute, vol. V. 
Coughtrey. New Zealand Hydroidece . Transactions of the 
New Zealand Institute, vols. VII. and VIII. 
