42 
Journal of the 
borne close to the summit of each internode, wrinkled transversely, 
and bearing each a single hydrotheca; distal part curving from 
under the hydrotheca, smooth ; proximal internode short, without 
appendages. Hydrothecas ventricose, the back bent inwards at 
the summit of the pinna, forming a cavity which is occupied by 
the sarcothecse; aperture at right angles to the hydrotheca and 
pinna, broadly notched behind. Sarcothecse bitlialamic, with 
slender pedicles, two abreast behind each hydrotheca, and one in 
front, the latter often obsolete. 
Gonothecce ? Almost colourless, transparent. I{ab. Queenscliff. 
P. spinulosa. n. sp. Plate XY, fig. 8. 
Hydrorliiza delicate, flat, with transverse markings at short 
intervals along the margins; shoots pinnate, about one-fifth of an 
inch in height; pinnce alternate, each springing from about the 
middle of an internode, and bearing a single hydrotheca; distal 
portion curved, and abruptly contracted behind the hydrotheca to 
half the thickness of the lower part, contracted portion slightly 
constricted at two or three points on the inner side, and pro¬ 
longed upwards into an incurved spine above the margin of the 
liydrotheca; proximal intemode short, without appendages. 
Hydrothecce compressed laterally, attached to the pinna by the 
back and part of the base; aperture at right angles to the cell 
and pinna; an intrathecal ridge springing from the back of the 
cell near the aperture, curved forwards and downwards nearly to 
the base of the cell. Sarcothecse bithalamic, with slender pedicles, 
two abreast above the liydrotheca, one in front, one in each axil, 
and one on the lower part of each stem-internode; those in the 
axils and above the hydrothecse with the upper chamber com¬ 
pressed, flabelliform. 
Gonotheca ? Colour, pale yellowish, transparent. Ilab. 
Queenscliff. 
P. pulchella. n. sp. Plate XY, fig. 6. 
Hydrorliiza dense, shoots crowded, pinnate, about one-fourth of 
an inch in height, transversely wrinkled; pinnce alternate, each 
rising from about the middle of an internode, and bearing a single 
liydrotheca ; distal part curving abruptly from under the hydro- 
