a General History of the Marine Polyzoa. 3 
the upper extremity occupied by a triangular mandible; below 
each of the inner cells two small raised avicularia, with 
pointed mandible directed downwards* ; occasionally gigantic 
avicularia resembling those on the marginal cells (except in 
size) distributed over the zoarium. Vebracular grooves ex- 
tending to the very base of the organ; seta of great length 
and serrate. Occiwm immersed, smooth; front flattened, 
surrounded by a raised border. 
Loc. Off Curtis Island. 
In some cases the large avicularia, of the same type as those 
‘on the marginal cells, scattered amongst the zocecia are a 
striking character; but they are very commonly wanting. 
The vibracular seta in this species is of remarkable length. 
Caberea rudis, Busk, which was originally described from 
Bass’s-Straits specimens, also occurs in Capt. Warren’s 
collection. 
Family Membraniporide. 
MeEmBRANIPORA, De Blainville. 
Membranipora pyrula, n. sp. 
(Ries 25) 
Membranipora lineata, MacGillivray, Prodr. Zoology of Victoria, Polyzoa, 
decade 3, p. 34, pl. xxvi. fig. 3. 
Zoecia pyriform, quincuncial, hyaline, silvery; area elon- 
gate-oval, occupying three fourths of the length, wholly 
covered in by membrane, surrounded by a thickened border, 
from which spring on each side four broad flattened spines 
with an expanded base, which bend over the area and meet 
in the centre; a single spine at the bottom, or (sometimes) 
two or three; on each side of the semicircular orifice an erect 
spine; the portion of the cell below the area smooth and 
glassy, the base subtruncate or (sometimes) pointed. Large, 
elongate, subspatulate avicularia, with dark-coloured mandible, 
distributed amongst the zocecia, occupying a distinct area and 
replacing a cell. Oacia somewhat: elongate, smooth, with a 
central keel running from the margin to the summit, and on 
each side of it, close to the margin, a fossa. 
Loc. Bass’s Straits, very common. 
This handsome species is undoubtedly identical with the 
M. lineata of MacGallivray’s work on the Victorian Polyzoa ; 
but it has no claim whatever to the Linnean name. 
* Except when the ocecium is present, in which case it points upwards. 
p Pp p P 18 p 
