t
collection does not present any peculiar Australian generic form. It is
far otherwise, however, with respect to the species. Of these three only
are found in the European seas namely:

Sertularia operculata.
Campanularia dumosa.
Campanularia volubilis ?

Of which the first is a perfect cosmopolite, and the last is perhaps
doubtful.

There are also, what is much more strange, not more than three species
which I have been enabled to trace to any other locality, even in the
Southern hemisphere. These are:

Sertularia elongata.
Sertularia divaricata, n. sp.
Plumularia macgillivrai, n. sp.

The first occurring in New Zealand; the second on the south coast of
Patagonia and in the Straits of Magellan; and the third (which, however,
is not, strictly speaking, an Australian form, having been procured in
the Louisiade Archipelago) in the Philippine Islands. With these six
exceptions, the whole number of species would therefore, to a certain
extent, appear to be characteristic of the Australian seas.

Of the thirty-one species, it appears strange that not less than
twenty-five should here be described as new; and there can be no doubt
many so described are included under the vague and uncertain descriptions
of Lamarck and Lamouroux; but, in the absence of authentic specimens, or
trustworthy figures, I have found it impossible to identify
satisfactorily the species described by them, and have therefore thought
it better to assign new names rather than to apply former ones, which
would in all probability prove incorrect. It is hoped, at all events,
that the descriptions here given will be found sufficient to prevent any
misconception of what is intended in the following catalogue.

The mode in which the species are arranged will be seen from the
following synoptical arrangement:

---

SYNOPTICAL ARRANGEMENT OF THE GENERA AND SPECIES OF SERTULARIAN ZOOPHYTES
COLLECTED ON THE VOYAGE OF THE RATTLESNAKE.

Order. ANTHOZOA HYDROIDA.
Sub-order. SERTULARINA.
Fam. 1. SERTULARIADAE.
Gen. 1. Sertularia.
Sec. 1. Cells alternate (Sertularia).
(a) Cells distichous.
1. S. elongata.
2. S. divaricata, n. sp.
3. S. crisoides.
(b) Cells secund.
4. S. pristis.
Sec. 2. Cells opposite (Dynamena).
(a) Cells distichous.
5. S. subcarinata, n. sp.
6. S. patula, n. sp.
7. S. orthogonia, n. sp.
8. S. mutulata, n. sp.
9. S. operculata.
10. S. divergens, n. sp.
11. S. trigonostoma, n. sp.
12. S. digitalis, n. sp.
13. S. loculosa,