368 Rey. T. Hincks’s Contributions towards a 
confers upon it a marked individuality, it is really a very 
typical Bugula, so far as all the essential elements of structure 
are concerned. 
Family Cellariide. 
CELLARIA (part.), Lamouroux. 
Cellaria jistulosa, var. australis, MacGillivray. 
(Pl. XIV. figs. 4, 4a, 42.) 
Zoartum much and irregularly branched, consisting of 
stout, unjointed, cylindrical stems (made up of as many as ten 
rows of cells), often of considerable length, tapering slightly 
downwards, from which similar shoots are given off without. 
regularity on all sides, originating in a horny base, which 
rises in all cases from the centre of a zocecium; the whole 
rooted by a mass of tubular fibres. Zoweia very regularly 
six-sided, usually truncate above and below, contiguous in the 
same line; of considerable depth, the walls sloping inward 
and minutely pitted, slightly crenate at the top; area very 
small, occupying the lower half of the cell; orifice central, 
arched above, the lower lip carried up into a very prominent 
mucronate projection, rounded at the top, a small denticle on 
each side of it; above the orifice a large circular ocecial 
opening. Aviculartwm in the line of the cells, placed on a 
transversely oblong area, suberect; mandible very wide and 
shallow, arched above and straight below, directed upward. 
Loc. Victoria (MacGillivray) ; Port Philip Heads (J. B. 
Wilson). 
This form is described by MacGillivray as C. fistulosa, var. 
australis ; but the differences between it and the normal C, 
fistulosa are such as to raise a doubt whether it would not 
more properly be ranked as a distinct species. 
J am unable to say whether the peculiar habit of growth 
which characterizes all the specimens I have seen is con- 
stant; but if so, it is a point of considerable importance. 
The jointing of the stem, by which it is divided into definite 
segments (or internodes) in the ordinary forms of Cellaria, 
has disappeared, and with it the regular dichotomous ramifi- 
cation. ‘The shoots are continuous throughout, and the 
branches are given off irregularly, each of them originating 
from the centre of one of the zocecia, to which it is attached . 
by a chitinous base (Pl. XIV. tig. 4a). 
The large size of the cylinders is also a distinctive point, 
for though there is considerable variability in this respect in 
. 
