40 
Journal of the 
Gonotheca? ? Transparent, almost colourless, shrivels when dry. 
llab. QueensclifF. 
P. setaceoides. n. sp. Plate XY„ fig. 4. 
Hydrorliiza stout, with waved margins, shoots pinnate, from 
one to three inches in height. Pimue recurved, alternate, borne 
near the summits of the internodes, and transversely wrinkled. 
Hydro thecae distant, set at an angle of about 40°, cup-shaped, with 
entire margins. Sarcotheca? bithalamic, with slender pedicles, two 
abreast behind and one in front of each hydrotheca, one on a 
separate short internode between every two hydrothecae, one at 
the base of each pinna, and one on the lower part of each stem- 
internode. A short proximal internode on each pinna without 
appendages. 
Gonothecie large (eight or nine times as long as the hydrothecae), 
obliquely truncated a little above the broadest part, transversely 
rugose, borne at the bases of the pinna?, often forming two rows 
extending half-way up the stem. 
Pale yellowish brown, or colourless and transparent. 11 ah. 
\Villiamstown, Queenscli ff. 
There appear to be two varieties of this species, one very lax 
and delicate, two or three inches in height, and resembling 
Mr. Hincks 5 figure of P. setacea , the other not more than an inch 
in height, with setaceous pinna?, equal all up the stem, and only 
about one-twenty-fourth of an inch in length. This small form 
was from QueensclifF, and so closely resembles the other in minute 
structure that I do not think they can be separated, unless the 
gonothecce, which I have not yet seen, should prove different from 
those of the larger form. The trophosome of this species seems 
scarcely to differ from that of P. setacea, except that the nemato- 
pliores of the latter are more slender, and the laterals are raised 
higher above the margin of the calycle. The gonotheca? somewhat 
resemble those of P. halecioides. 
P. delicatula. n. sp. Plate XY, fig. 2. 
Hydrorliiza with waved margins, stems slender, pinnate, about 
an inch in height; pinme alternate, one borne near the summit 
of each intemode, transversely wrinkled. Hydrotheca? nearly 
