PROCEEDINGS OF SECTION D. 49]. 
acuminate, occasionally blunt, without veins, margin slightly 
wavy, minutely denticulate. 
Sori unknown as yet. 
Scinata moniliformis. — Frond membranaceous, cylindrical, 
flattened, extremely constricted at the joints, dichotomously 
decompound, with prolifications appearing below the upper part 
of the articulations. Articulations united by a very narrow neck, 
the lowermost obconical, the middle ovate-oblong, the uppermost 
lately formed sub-rotund. 
Chondriopsis foliifera.—Plant nearly pyramidal, with branches 
alternately pinnate with great regularity. Pinne springing from 
the margin, or within the margin of the rachis, spreading both 
ways, linear, lanceolate. Simple, or beset with an additional 
series of similar pinnules ; all, on both sides, extremely slender, 
the last fruit-bearing. Spherospores rather irregularly arranged 
on the upper part of the pinnules, marginal keramidia on the 
pinnules either solitary or few in number. Cortical cells angular, 
a little longer than their own diameter. 
Polysiphonia sphacelarioides.—Stem spread out in every direc- 
tion, loosely entwined among other algz, with long, curved, hair-like 
threads rooting here and there. Articulate, devoid of cortex, 
distantly branched with dense ramelli. Rachis often extending 
beyond the branchlets, ramelli subvertical, chiefly secund, younger 
ones slender to a distance from the base, older branchlets flexible. 
Articulations of the older branchlets 7-siphoned, mostly 2 to 3 times. 
as long as their diameter. The final ramelli about equal to their 
diameter. 
Cliftonea pectinata.—The cystocarps in Cliftonea pectinata 
(observes Agardh) were first discovered by J. Bracebridge Wilson. 
In the fruit-bearing specimens sent to me I have seen cystocarps 
of considerable size, sub-globose, arranged in a row along the 
midrib, between the lacinie, produced upon the older parts of the 
plant ; protected, as it seemed to me, by the sterile laciniz 
encompassing them from the side of the phyllodes. In a trans- 
verse section I observed the pericarp to be formed of two strata, 
that is, of exterior cells closely packed together, and inner ones 
more loosely arranged, as though meeting one another only at 
scattered points ; in the lower part of the pericarp more extended 
longitudinally. 
In the lower part of the cystocarp there is a placenta, from 
which large pear-shaped spores proceed, supported on long stalks, 
collected into several tufts, such as are normally present in the 
Rhodomela group. On the lowermost part of the placenta I noted 
a cell of greater size, as though primary, filled with a quantity of 
granular matter. This cell is joined by other smaller cells, loosely 
arranged, touching it round about in places, from the upper part 
of which the spores at length proceed. 
