2. P. hians, n. sp.
Cell cup-shaped, deep, cylindrical; mouth nearly vertical; margin with three teeth on each side, the middle one the longest, acute, much expanded, the other more rounded; a wide notch posteriorly. Rostrum, arising from the rachis, as long as the cell, slender, tubular, adnate; lateral processes very small, ovarian receptacles ---- ?
Habitat: Prince of Wales Channel, Torres Strait, in 9 fathoms.
Colour bright brown, rachis shining, very dark brown; polypidom about six inches high, simply pinnulate, pinnules about half an inch; thickly and regularly disposed, alternate.
3. P. delicatula, n. sp.
Cell cup-shaped, rounded, mouth at an angle of 45 degrees; margin dentate, with two lateral teeth of equal size and a central one in front longer, all acute; entire posteriorly. Rostrum a little longer than the cell, scarcely connected with the rachis, slender, and closely adpressed and adnate to the cell below, wide and projecting upwards; lateral processes large, rising above the margin of the cell, conical, tubular, or canalicular.
Habitat: Prince of Wales Channel, Torres Strait, in 9 fathoms.
Colour of rachis and pinnules, delicate yellowish white above; of rachis, light brown, inferiorly; polypidom about two inches high, rising in several straight simply pinnulated fronds from a common centre; pinnules ascending about 1/4 inch.
4. P. aurita, n. sp.
Cells cup-shaped, tapering at bottom, constricted just below the top; mouth at an angle of 45 degrees, circular; margin subcrenate, plicate, with three folds on each side, with a wide shallow notch in front and entire behind. Rostrum, slender, attenuated below, adnate up to the cell, summit contracted, tubular; lateral processes very long, expanding, rising far above the margin of the cell, conical, tubular.