ng 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.

10. C. elegans, n. sp. Table 1 figure 2.

Cells elongated ovoid; avicularia large and projecting, without any
superior appendage; vittae narrow, rather anterior.

Habitat: Bass Strait, 48 fathoms. Port Dalrymple, on stones at low water.

A delicate and beautiful parasitic species; the branches slender and
spreading; colour white and very transparent. Cells regular and uniform
in size and shape. A very similar if not identical species occurs in
Algoa Bay, South Africa, the only difference between them being that the
latter is rather larger and has the vittae much longer; in the Australian
forms these bands do not reach above the middle of the cell, whilst in
the South African they extend as high as the mouth.

11. C. cornuta, n. sp.

Cells oval; avicularia in many cells wholly transformed into long pointed
retrocedent spines, on one or both sides, in others into shorter spines
or unaltered. Vittae linear, extremely narrow, entirely lateral, and
extending the whole length of the cell from the base of the avicularium.

Habitat: Bass Strait, 45 fathoms.

Colour yellowish white, growth small; parasitic upon C. amphora. As some
difficulty might be experienced in the discrimination of this species
from C. elegans, and another South African species (not the variety of C.
elegans above noticed) it is requisite to remark that the long
retrocedent spines when present are not placed upon or superadded to the
avicularia, but that they seem to represent an aborted or transformed
state of those organs. They vary much in length and size in different
cells, and even in those of the same branch; as it frequently happens
that there is a spine, usually of diminutive size, on one side and a very
large avicularium on the other, and sometimes (bu