n. sp.
14. S. unguiculata, n. sp.
15. S. tridentata, n. sp.
2. Pasythea.
16. P. hexodon, n. sp.
3. Plumularia.
Sec. 1. Angiocarpeae.
17. P. huxleyi, n. sp.
18. P. hians, n. sp.
19. P. delicatula, n. sp.
20. P. aurita, n. sp.
21. P. brevirostris, n. sp.
22. P. ramosa, n. sp.
23. P. divaricata, n. sp.
24. P. phoenicea, n. sp.
25. P. longicornis, n. sp.
26. P. macgillivrayi, n. sp.
Sec. 2. Gymnocarpeae.
27. P. effusa, n. sp.
28. P. campanula, n. sp.
Fam. 2. CAMPANULARIADAE.
4. Campanularia.
29. C. volubilis (?)
30. C. dumosa.
5. Laomedea.
31. L. torressii, n. sp.

Order. ANTHOZOA HYDROIDA.

Suborder. SERTULARINA.

Fam. 1. SERTULARIADAE.

Gen. 1. Sertularia, Linnaeus.

1. Cells alternate (Sertularia).

a. Cells distichous.

1. S. elongata, Lamouroux.

Habitat: Swan Island, Banks Strait, thrown on the beach. Port Dalrymple,
on stones at low water. (Also New Zealand.)

2. S. divaricata, n. sp.

Cells urceolate-subtubular, or very little contracted towards the mouth,
often adnate to the rachis nearly their whole length; mouth looking
upwards, with three large acute teeth, two lateral, and one rather longer
than the others, and slightly recurved, above. Ovicells ---- ?

Habitat: Bass Strait, 45 fathoms, dead shells.

Colour dirty yellowish white; polypidom branched, from a common stem;
branches irregular (?) straggling, pinnate and bipinnate, pinnae and
pinnules divaricate at rightangles, alternate; rachis flexuose, or with
an angle at the origin of each pinna. The cells are placed at wide
distances apart; small and adnate very nearly to the top. The mouth
circular, with three large teeth, the one above frequently obscured by
adventitious substances, very acute, ascending, and a little recurved.

Sertul. gayi. (Lamouroux. Exp. page 12 plate 66 figure 89 has four
teeth.)

This species occurs also on the south coast of Patagonia, and the Straits
of Magellan; in the latter locality, however, the habit is much more
robust.

3. S. crisioides, Lamouroux. (Dynamena.)

Cells adnate, conical, slightly curved, truncate at bottom, narrow at
top; mouth vertical, external.

Habitat: Off Cumberland Islands, 27 fathoms.

Very like a Thuiaria, but the cells are not immersed, though very closely
adnate, and the outer angle of the square base of each cell is in contact
with the upper and back part of the one below it, so that a small
triangular space or opening is left below each cell. The branches are
v