TRANSACTIONS OF THE SECTIONS. 119 
through a rounded opening with the interior of the rachis. Many of the. species, 
but not all, have also a similar tube or process, arising from the rachis immediately 
below the cell. It is this process which has sometimes been denominated a “ bract.’ 
Where this anterior process is wanting, there is usually a tube projecting from the cup 
itself, but in this case the tubular process seems to be of a different nature, supporting 
at its extremity a small cup-like cell. P. cristata, in one of its varieties, affords an 7« 21:7. 
instance of this arrangement. Should a division of the genus Plumularia, as at pre- 
sent constituted, be eventually made, those species of which P. setacea may be taken 
as the type, would form a second genus, closely allied to Laomedea; and Plumularia 
falcata might safely be referred to Sertularia. A link between the latter genus and 
the so-called Plumularia in question, might be indicated in the eighth species of 
Sertularia above noticed under the name of Scrt. unilateralis. The species of Thuiaria + 777.“ 
differs from Thuiaria articulata in the exact opposition of the pinne, and in the fre. (#@ 
quency with which the extremities of the pinnz are furnished with long tendril-like 
tubes, by which the polypidom clings to surrounding bodies, or one frond to another. 
As this is in all probability the species referred to by Ellis ‘‘as having been sent to 
him from the Kast Indies,’’ and as it is undoubtedly distinct from our 7’. articulata, 
the name of 7. Ellisii is proposed for it, with the character,—“T. pinnata, pinnis 
Oppositis. Capsulis ovarialibus ovatis, ore rotundo, incrassato.”’ 
Of the two species of Antennularia, one corresponds with our Ant. ramosa. The 
other species resembles the Cymodocea simplex of Lamouroux. It is however clearly 
an Antennularia, and the name of Antennularia Cymodocea is proposed for it, with 
the character,—‘“‘ Ant. caulibus simplicibus: ramulis biseriatis, utraque serie, alter- 
nantibus.”? Hab. Af. aust., Australia, &c. 
With respect to the geographical distribution of these Sertularians, it may be 
remarked that of the nine species of Sertularia, six are British forms also; of the 
other three, one may be common to Australia, and no other locality is known for the 
remaining two. Of the five Plumularie, three are also members of the British Fauna ; 
and of the two Antennularie, one is also British.. Thus of the whole number. 17, 
ten are European forms,—a circumstance calculated to excite much surprise. None 
of the South African Sertulariade, except Sertularia operculata, and perhaps S. ar- 
buscula, occur among those which have come under the author’s notice from 
Australia or New Zealand. 
Of Polyzoa, there were noticed 15 or 16 species, viz. 1. Cellularia, 2 sp.; 2. Flus- 
tra, 2sp.; 3. deamarchis, 1 sp.; 4. Catenicella, 3 or 4 sp.; 5. Serialaria (Amathia), 
3 sp.; 6. Salicornaria, 1 sp.; 7. Elzerina?, 1 sp.; 8. Crisia, 2 sp. ᾿ ἣ ‘ 
The species of Flustra are, first, Flustra ?, distinguished by all the marginal 
cells having an avicularium imbedded in them. There appear to be two varieties of 
this species. The second species is the beautiful Flustra bombycina; it is usually, 
parasitic upon sponges or other zoophytes, especially on Sertularia polyzonias. The 
species of 4camarchis, is that described by Krauss under the name of J. tridentata.: 
It belongs to a group of Acamarchis, in which the species are distinguished by their. 
containing a blue colouring matter, as is another set by the possession of a red colour, 
such as occurs in Cellularia plumosa of our seas. 
_ The species of Serialaria (or Amathia) are—-1. Amathia biseriata (Krauss) ; 2.. 
A. cornuta ; 3. A. lendigera; or at all events a species very much resembling that 
British form. 
The Salicornaria is identical with our S. farciminoides, as is one of the Crisie with 
the British C. denticulata, The other Crisia is a peculiarly beautiful, pearly species, 
unlike any British form. The genus here doubtfully designated under the name 
Elzerina (Blainville), resembles Sa/icornaria in many respects, but is horny instead 
of calcareous. Two or three other species, referable to the same genus, occur in. 
Australia, but the South African one does not appear to haye been found there. Of 
the three or four species included under the name Catenicella, one will probably here- 
after constitute the type of a distinct genus, but as it possesses many characters in 
common with the others, the separation is deferred. One of the species here called 
Catenicella, is most probably the Menipea cirrata of Lamouroux, or the Cellaria 
eirrata of Ellis and Solander, of which a figure is given in their work, which is copied. 
by Lamouroux. Great confusion appears to exist in this genus up to the present 
time ; but it would occupy too much space in this abstract to enter upon the con- 
