Habitat:  Prince of Wales Channel, Torres Strait, 9 fathoms.

Colour very light yellowish.  Polypidom simply pinnate, about two inches high:  longest pinnae about half an inch.  Cells small adnate, projecting suddenly at top, and much contracted at the mouth.  The mouth is of a triangular form, the longest side of the triangle being below.  The cells are placed in pairs, but one is always a little higher than the other (subalternate) and one pair is placed on each internode on the pinnae.  The stem is also indistinctly divided into internodes, from each of which a single pinna is given off alternately on opposite sides, and besides the pinnae there are three cells on each internode, two on the side from which the pinna springs, and on the opposite side alternate in position to the other two.

12.  S. digitalis, n. sp.

Cells digitiform, slightly curved to the front, mouth circular, looking directly upwards.  Margin entire, expanded.  Ovicells long-ovoid, muricate, spines numerous crowded, mouth prolonged, tubular.

Habitat Prince of Wales Channel, Torres Strait, 9 fathoms.

Colour dark grey, almost black.  Stem two or three inches high, rising either from a strong main trunk (?) or from a mass of intertwined radical tubes.  Stems or branches pinnate:  pinnae or branches alternate, straight, divaricate.  The cells forming a pair, are, on the branches, adnate to each other throughout their whole length.  But on the stem the cells are distichous and wide apart.  The ovicells are peculiar in their long flask-like form, and tubular mouth.  They are placed all on one side of the rachis, generally in single file, but sometimes in pairs.

13.  S. loculosa, n. sp.

D. distans ?  Lamouroux.

Cells completely adnate to each other, each apparently divided into two compartments by a transverse constriction.  Upper half turned horizontally outwards.  Mouth roundish, irregular, contracted:  looking outwards, and a little downwards.  Ovicell ——­ ?

Habitat:  Bass Strait, 45 fathoms.

Colour deep brown; polypidom simple unbranched (?) about half an inch high, parasitic upon a broad-leaved fucus.  The cells 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.