ing teeth.

Habitat: Bass Strait, 45 fathoms.

A very distinct and beautiful species. The frond is about half an inch
wide, and though really umbilicate and subinfundibuliform, does not at
first sight appear so, being much more expanded on one side of the centre
than on the other.

19. ESCHARA, Ray.

1. E. lichenoides, M. Edwards. Mem. sur les Eschares. Ann. d. S. N. tome
6 page 31 plate 2 figure 3.

Habitat: Australian Sea, probably Bass Strait. (It also occurs in Algoa Bay.)

20. DIACHORIS, n. gen. Table 1 figures 10 to 12.

Cells separate, each connected with six others by short tubes; disposed
in a horizontal plane, and forming a continuous irregular frond; free, or
partially adnate.

The mode of arrangement and interconnection of the cells in this genus is
remarkable, and highly interesting. It represents, in fact, a dissected
Flustra or Membranipora. The cells are disposed in linear parallel
series, and those of two contiguous series are alternate with respect to
each other. Each cell is connected with one at either end in the same
linear series by a rather wide short tubular prolongation, and with two
on each side in the contiguous series by narrower tubes, so that each
cell, except in the marginal rows, is connected with six others. It is
this mode of interconnection of the cells that affords the diagnostic
generic character. There is but one species in the present collection,
but in Mr. Darwin's there are two others from the Straits of Magellan, as
yet undescribed.

1. D. crotali, n. sp. Table 1 figures 10 to 12.

Cells erect, open in front, perforated on the sides and bottom; a
lanceolate appendage articulated to each upper angle. Ovicell conical,
placed on the upper edge.

Habitat: Bass Strait, 45 fathoms.

The frond, though not strictly speaking adnate, as it seems to have no
attachments, is usually spread loosely over other polyzoa. There is no
appearance of a movable mandible in the lanceolate appendages, but which,
nevertheless, most probably represent avicularia. These organs are of a
lanceolate form, with an elevated ridge or keel along the back, and
slightly concave beneath. They project in front, slightly depending; and
at the base of each is a rounded eminence.

Fam. 6. CELLEPORIDAE.

Polyzoarium missive or crustaceous, composed of ovate cells in
juxtaposition and arranged, more or less regularly, in linear series,
radiating from a central point or line.

21. CELLEPORA, Otho Fab