s are so closely
conjoined as to form but one triangular body, which appears as if divided
into five loculaments by transverse constriction. The upper apparent
constriction however seems merely to indicate the line of flexure of the
upper part of the cell upon the lower. The form of the conjoined cells is
not unlike Lamouroux' figure of S. (D.)distans; but the present is
clearly not that species.

14. S. unguiculata, n. sp.

Cells urceolate, upper half free, projecting in front, and much
contracted towards the mouth; elliptical, with the long axis horizontal,
looking forwards and a little outwards; two long lateral teeth, the outer
the longer and usually incurved. Ovicell ovoid; mouth wide, with a much
elevated, thickened border.

Habitat: Swan Island, Banks Strait, thrown on the beach.

Colour bright brown; polypidom pinnate; the stems arising from creeping
radical tubes, very thickly intertwined around a long slender body. The
stems are from one to four inches long, the pinnae about 1/4 to 1/2 inch,
alternate. The rachis of the stem is divided into distinct internodes,
from each of which are given off two pinnae, and upon which are also
placed usually six cells, three on either side. The pinnae are also
divided, but less distinctly, into internodes of various lengths. The
pairs of cells on the pinnae are all secund, and in contact with each
other at their bases, though widely divergent above.

15. S. tridentata, n. sp.

Cells urceolate, ventricose below, contracted towards the mouth. Mouth
looking forwards and outwards, circular, with three acute teeth, two
lateral, longer than the third, which is above.

Habitat: Bass Strait, 45 fathoms.

Colour yellowish white. Polypidom simply pinnate, about 2 1/2 inches
high; pinnae in the middle 3/4 of an inch. The cells are ventricose
below, and almost flask-shaped. The two lateral teeth are long, acute,
and slightly everted; the upper third tooth is sharp, but not near as
long as the others; the border of the mouth is as it were excavated
below, so that the mouth is as nearly as possible vertical. Contrary to
what is the case in S. divergens, but exactly as is represented in
Savigny's figures of the so-called S. disticha (Egypt plate 14 figures 2
and 3); and S. distans (Egypt plate 14 figures 1 and 3) the lateral teeth
are sloped or bevelled off from below upwards, and not from above
downwards, as in S. divergens (Mihi).

2. Pasythea, Lamouroux.

Cells in distinct