146 ZOOPHYTOLOGY. 
many Australian rarities, and for much curious imforma- 
tion. 
12. C. castanea, nu. sp. 
Cells ovate, elongated. Superior lateral processes small and rounded ; 
united above the cell-aperture by a smooth prominent ridge; the lateral 
processes continued round the lower angles of the mouth, so as almost to 
form a corresponding ridge beneath. 
Cell-mouth small and round. Operculum very thick. Avicularia small, 
lateral; vitte linear, lateral, extending nearly the whole length of the cell. 
Ovicell (?). 
Coencecium forming graceful curling tufts. Cells of a rich 
chestnut hue, contrasting well with the bright red of the 
fibrous compound stem. Allied to C. gibbosa (Busk), which 
does not occur in the collection. 
Bass’s Strait ; Dr. Harvey. 
13. C. umbonata, Busk. 
14. C. crystallina, n. sp. 
Cells subglobular, pyriform, fringed on either side by a wide hollow bor- 
der, spreading upwards, outwards, and slightly forwards, into large lateral 
processes, frequently furnished with small lateral avicularia, seated in cup- 
like depressions. 
Two arched markings, very constant in form, traverse this wide portion 
of the lateral process, which is continued downwards in a hollow fringe to 
the base of the cell. 
Cell-aperture large; rim slightly prominent. Vittz long and well marked, 
sublateral, and extending nearly to the level of the lower lip. Front of cell 
studded with elevated papille, and whole surface ornamented with delicate 
diverging lines, which give the ceencecium a beautiful glistening appearance. 
An elevated ridge runs down the middle of the back, the lateral portions 
falling off like the roof of a house, giving the transverse section of the cell 
a somewhat triangular outline. Ovicell unknown. 
Parasitical in delicate glassy tufts on Polyzoa. 
Bass’s Strait ; Dr. Harvey. 
A very distinct and beautiful form. The arches in the 
hollow wings seem to be lines along whose course the mem- 
branes of which the opposite walls of the wings are composed 
are in contact. In the Vittatz generally the double cell- 
wall is by no means so distinct as in the fenestrate group. 
There are, however, frequent indications that the structure 
is the same. 
The vittee seem to be rows of bead-like spaces between the 
layers. 
15. C. Buskii, n. sp. 
Cells almost cylindrical, slightly contracted towards the truncated base. 
Connecting horny tube very short. Superior lateral avicularian processes 
represented by longer or shorter slightly retrocedent spines, or by open 
lacerated cups usually bearing small avicularia at the base. Spines longer 
