136 
TEOCEEDINGS QE SOCIETIES. 
inner layer, the true wall of the cell. Chambers formed of the outer 
film are often entirely open or irregularly perforated with large aper¬ 
tures. 
The outer membrane seems to have something to do with the deve¬ 
lopment of the cell. It is very possible that during the process of the 
extension of the coenoecium by gemmation, the outer layer may form a 
dilatation expanding and filling with formative blastema, and that within 
this sac the true cell wall and the organs of the polypide may be subse¬ 
quently specialized. In C. Harveyi , at a bifurcation, the young secondary 
cell is entirely invested by this membrane during its early development, 
and it remains permanently entire over the calyptriform ovicell, in both 
these cases looking like the natural continuation and “ finish” of the 
abortive cup of the superior lateral process. 
In all cases where a secondary cell is the result of a further lateral 
development of a primary cell, the former originates in the avicularian 
chamber and process of the latter. In C. geminata one lateral process 
of each axial cell is always developed into a secondary cell; very pro¬ 
bably the avicularian chamber, with its processes, whatever their direct 
teleological object, may be the aborted indications of a constant tendency 
towards development in this direction. 
Notwithstanding the numerous additions to the genus, Mr. Busk’s 
original subdivisions retain their natural integrity. C. alata fraternizes 
with the typical Tenestratse. Busk’s specimen of C. aurita must have 
been poor. A good example differs so much from the Fenestrate group, 
and so closely approaches C. geminata , which could not possibly be 
associated with them, that it has been deemed advisable to put the two 
species provisionally at the end of the list, thus indicating the tendency 
of C. geminata towards the structure of the next genus. 
C. Harveyi stands alone a representative of the “Fasciatsethe po¬ 
sition of the ovicell is very characteristic. 
The new “Yittatse” are all normal. In this group there are two 
modifications of the ovicell: in the greater number it is galeriform and 
superior, encroaching on the cavity of the cell above it, which is sessile, 
by a broad base on the ovicelligerous one. Two, C. taurina and C. per¬ 
forata, have a globular vesicle sessile on the older cell of a geminate pair. 
a. —GaTEXICELLJE FENESTBAT2E (Busk). 
1.— C. lorica (Busk). 
A single fragment; Bass’ Strait; Dr. Harvey. 
2. C. ventricosa (Busk). 
Abundant, Bass’s Strait, Yan Diemen’s Land; Dr. Harvey. Port 
Fairy; James Dawson, Esq. 
3. — C. liastata (Busk). 
Bass’s Strait; Dr. Harvey. New Zealand, abundant; Dr. Joliffe. 
