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, 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.