99 
Zoophytes from Australia and New Zealand. 
bability, lead to most interesting results in regard to our 
knowledge of the distribution of the Hydroida. Many of them 
are singularly widespread, one or two (e. g. S. operculata 
and Sertularella Gayi) almost cosmopolitan. On the other 
hand, even when studying the Hydroid fauna of a compara¬ 
tively restricted area, such as the Australasian seas, we become 
aware, somewhat dimly as yet, of the existence of several 
more or less distinct and circumscribed provinces. The Hy- 
droids of Torres Straits and the Louisiade archipelago are, 
as has been already remarked, singularly different from those 
of the southern and south-eastern regions, e. g. Adelaide and 
Bass’s Straits ; and the forms inhabiting New Zealand are 
similarly distinct from the Australian species. S. operculata 
and S. elongata are, I believe, the only' Sertularians which 
have hitherto been recorded on good authority from both 
localities. To these I can now add Sertularella Johnstoni (a 
common New-Zealand form, of which I possess specimens 
from Tasmania) and Sertularia minima , D’A. W. T. 
For a most able and masterly sketch of the distribution of 
the Sertulariidse see the introduction to Prof. Allman’s magni¬ 
ficent work on the gymnoblastic Hydroids. 
The species described in the following pages have been 
accumulated from various sources. Many of the specimens 
were selected from the refuse of Harvey’s great collection of 
Australasian seaweeds, a store which, once upon a time, yielded 
many new Polyzoa to Prof. Sir Wyville Thomson. Another 
portion were sent home by Dr. Ferd. Muller, chiefly from 
Adelaide and the Gulf of St. Vincent ; while the remainder 
were principally collected in New Zealand by Dr. Jolliffe. 
The collection contained, in all, twenty forms belonging to the 
Sertulariidse and Thuiariidae, of which six are referable to the 
genus Sertularella , nine to Sertularia , four to Thuiaria , and 
one to Pericladium. Of these, ten are, I believe, new and 
undescribed • eight are known to us by the accounts of other 
authors ; and the two which remain are, unfortunately, repre¬ 
sented by such imperfect specimens that I am uncertain how 
to identify them with old species, and equally unwilling to 
designate them as new. 
I have also obtained in the same collection six or seven 
species of Aglaopkenia , about half of which I believe to be 
undescribed, and two or three Campanularians, which last, 
however, are in a sadly imperfect state of preservation. I 
hope shortly to be able to render an account of all these 
species. 
I must here express my warmest thanks to Prof. Sir Wy- 
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