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8 EXPLANATION OF THE PLATES.
P L A T E X I I .
Fig. 1. Draparnaldia piumosa. — Fig. 2. Draparnaldia repe-
tita.
P L A T E X I I I .
Fig. 1. Draparnaldia glomerata.— Fig. 2. Cheetophora dilatata.
— Fig. 3. Batrachospermum bombusinum.
P L A T E X IV .
Fig. 1. Batrachospermum pulcherrimum. — Figs. 2 and 3. B a trachospermum
alpestre.
P L A T E XV.
Fig. 1. Batrachospermum confusum. — Figs. 2 and 3. B a trachospermum
rubrum.
P L A T E X V I.
Figs. 1 and 2. Batrachospermum atrum. — Figs. 3 and 4.
Thorea ramosissima. The latter copied from Kiitzing, and
showing its capsular fructification.
P L A T E X V II.
Fig. 1. A cell of Zygnema nitidum, showing the curiously constructed
central organ with its radii ; the cruciform raphidelike
bodies, and the curved strings of the cytohlasts. —
Figs. 2 and 3. The same, exhibiting the appearance of
the central organ subsequent to the removal of the radii.
— Figs. 4 and 5. Filaments of a non-conjugating Zygnema
showing the inverted structure of the cells in certain species
of the genus. — Fig. 6. Portion of Cladophora crispata,
showing the vascular network which connects the zoospores
in the early period of their formation. — Figs. 7 and 8.
Exhibit the ringed apparatus, with which the reproductive
cells in the genus Vesiculifera are furnished; as also the
sporangia and the vascular network.
P L A T E X V II I.
Figs. 1 and 2. Zygnema serratum. The former representing
the filaments in its young condition, and showing the spiral
disposition of the endochrome; and the latter, the mode
of conjugation of the filaments and the sporangia.
P L A T E X IX .
Figs. 1 and 2. The same conditions of Zygnema orbiculare.
P L A T E X X .
Zygnema alternatum in a state of conjugation.
P L A T E X X I.
Zygnema interruptum in a similar condition.
P LA T E X X I I .
Figs. 1 and 2. Free and conjugated states of Zygnema
nitidum.
P L A T E X X I I I .
Pigs. 1 and 2. Zygnema neglectum. — Figs. 3 and 4. Zygnema
deciminum.
P L A T E X X IV .
Figs. 1 and 2, Free and conjugated states of Zygnema
belle.
P L A T E X X V .
Figs. 1 and 2. The same conditions of Zygnema pellucidwm.
P L A T E X X V I.
Figs. 1 and 2. Conjugated states of Zygnema curvatum.