General History of the Marine Polyzoa. 363 
XIII. POLYZOA FROM VICTORIA AND 
WESTERN AUSTRALIA. 
Under the present heading I shall continue the account of 
the Polyzoa dredged by Mr. J. Bracebridge Wilson off Port 
Phillip Heads, Victoria*. The collection which he has 
placed in my hands for examination is large and interesting, 
and I propose to give a complete list of the species contained 
in it which are not included in MacGillivray’s ‘ Decades,’ as 
well as descriptions of the new forms. 
Group Lwroprocra. 
Family Pedicellinide. 
PEDICELLINOPSIS, n. gen. 
Generic character.—Polypides cup-shaped, supported on 
chitinous tubes with a much enlarged base (consisting of an 
opaque white core, probably muscular, enveloped in a chiti- 
nous covering), by which they are attached to an erect tubular 
stem. Zoarium adherent by means of tubular root-fibres. 
This is a truly arboresent Pedtcellina, in which the soft 
parts, with the exception of the polypide itself, are clothed 
with a well-developed chitinous ccencecium. ‘The prolonga- 
tion of the common flesh from which the polypide buds is 
protected by a chitinous tube, which is open above, and at the 
base is attached to a stem (also invested with a solid periderm). 
The root-fibres by which the colony is fixed in its place are 
sheathed in chitine. The polypide resembles closely that of 
such a form as Pedicellina cernua, and, so far as I can judge 
from an examination of spirit-specimens, presents no special 
peculiarities ; it is not elevated above the orifice of the tube, 
but rests immediately upon it. The base of the tube is 
modified for the reception of a special structure ; and if we may 
judge from the analogy of such a species as Pedicellina gracilis, 
Sars t, it must be muscular in character, and probably much 
more powerful and highly organized, as it is much larger 
than the kindred structure which occurs in the latter. If it be 
muscular it must secure free mobility to the polypide in con- 
junction with the protection afforded by the solid covering, and 
* See ‘Annals’ for August 1882. 
+ In this form the mobility resides in the enlarged cylindrical base, the 
stem merely bending from the bottom, and the upper portions being chiti- 
nous and rigid, 
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