b. Vittatae.
Cells furnished with a narrow elongated band or vitta on each side, without fenestrae. Ovicells not terminal, galeriform.
8. C. formosa, n. sp.
Cells oval; avicularia large, flat, or cupped above. Vittae elliptical, rather anterior.
Habitat: Swan Island, Banks Strait.
Colour light plumbeous. Parasitic upon C. margaritacea. The cells are the largest of any in the Vittate division, and very regular and uniform in size and outline. The more distinctive characters are taken from the comparatively broad vittae, and the flat or cupped upper surface of the avicularia, which are usually continued downwards into a prominent ridge or ala.
9. C. gibbosa, n. sp.
Cells pyriform, ventricose posteriorly, much attenuated at bottom. Avicularia small, placed in front close to the sides of the mouth, at the base of strong conical pointed processes which project in front, and are connected across the top of the cell by a prominent toothed ridge. Vittae long linear, entirely lateral.
Habitat: Prince of Wales Channel, Torres Strait, 9 fathoms, mud.
Of a dark lead colour, when dry. Forms an elegantly branched bush about two inches high. The gibbous form of the cells, and the peculiar anterior position of the avicularia, at the base of the projecting lateral processes, at once distinguish it from all the other vittate species. The toothed (sometimes entire) ridge extending between the two lateral processes across the top of the cell and overlapping the mouth like a penthouse is also a very peculiar feature.