ZOOPHYTOLOGY. 149 
either side a projecting triangular catch, which fits into a 
notch in the lip. One would almost expect this apparatus 
to shut with a snap like the clasp of a purse, it is so nicely 
fitted, and so eminently mechanical-looking. 
Below the cell-aperture a long, depressed area stretches 
nearly to the base of the cell. The cell is much compressed 
laterally ; the side view is much broader, and almost reni- 
form. The cell-wall is double throughout, with a wide space 
between the layers, thus forming two distinct chambers, the 
inner not even resembling the outer in form. The anterior 
depressed area is formed by the outer layer alone, so that 
beneath there is still another space before reaching the inner 
wall. In the centre of the area a tube passes through this 
space, uniting two corresponding apertures, one in either 
membrane, and thus communicating directly with the interior 
of the cell. The side view shows the inner chamber as a 
doubly bent expansion of the common tube of the ccnc- 
cium. 
Here and there one of the cells of a row is about double 
the size of the rest. These large cells have their opercula 
always closely shut. They are slightly more gibbous than 
the others, but scarcely differ from them in form. They are, 
doubtless, the ovicells. 
The ccencecium is small and delicate, very calcareous, with 
a beautiful pearly lustre. Parasitical on Fucoids. 
Fremantle District, Western Australia (Dr. Harvey). 
Subsect. 2 Bi-Multiserialaria. 
2. Fam. SaricornariaAD, Busk. 
1. Salicornaria, Cuv. 
1. S. cenuirostris, Busk. 
2. Nellia, Busk. 
1. WV. oculata, Busk. 
3. Onchopora, Busk. 
1. O. hirsuta, Lamx. sp. ? 
3. Fam. CrELLuLariap#, Busk. 
1. Cellularia, Pallas. 
1. C. cuspidata, Busk. 
Abundant; Bass’s Strait; Dr. Harvey. New Zealand ; 
Dr. Joliffe. 
A very variable species. In one form the spine on the 
median cell at the bifurcation is absent, and in another there 
are two to three orifices in the back of the cell. 
