14 EXPLANATION OF THE PLATES.
P L A T E L X I.
Fig. 1. A portion of Chara vulgaris: a, b, c, d, e, f, g, h, indicate
the cells in which a circulation somewhat different
from that of the ordinary cells is manifest, the current
taking a circular instead of its usual spiral course. Fig. 2.
One of the sprouts more highly magnified, the arrows indicating
the courses of the molecules. Fig. .3. shows the
root cells, the currents in these agreeing with those of the
stems, due allowance being made for the difference in the
direction of their growth. Fig. 4. In fig. 4. the globule
is represented in profile with the stalk on which it
grows; also the nucule surrounded by its sprouts. Fig. 5.
is a view on a large scale of the stalk with a part of the
outside or transparent portion of the globule attached to it.
Fig. 6. is a cross section of the stalk only, the whole of
which is one cell, i, in figs. 5 and 6, indicates the mass
which circulates round the cells. — Fig. 7. A portion of a
cell of Chara vulgaris magnified, j j the Internal membrane
in its two strips; k k and 1 1 on the tubes, the lines to
which their edges adhered : these lines are indents on the
outside and ridges within, as shown in the section.— Figs. 8
and 9. A portion of a cell of Nitella w ith the tender green
tissue floated out. Figs. 10 and 11. show portions of
the denser fluid detached, and forming large spherical balls.
This Plate is copied from Var ley.
P L A T E L X I I .
Figs. 1 and 2. The segments forming the outer coating of the
globule magnified. Fig. 3. The filaments contained within
the globule. Fig. 4. The same more highly magnified,
showing the divisions into which each thread is divided, and
also the outlines of the animalcules contained singly in
each cell. Figs. 5 and 6. The animalcules more highly
magnified displaying the cilia by which their active movements
are effected. Figs. 7 and 8. Two of the peculiar
cells with the enclosed lateral circulating vesicle.
The figures contained in this plate are taken for the most
part from those illustrating M. G. Thurct’s paper on the
animalctiles contained in the anther of Chara.
P L A T E L X I I I .
Fig. 1. Batrachospermum proliferum. — Fig. 2. Batrachospermum
vagum.
P L A T E L X IV .
Figs. 1 and 4. Raphidia angulosa. — Figs. 2 and 3. Raphidia
viridis.
P L A T E LX V .
Figs. 1 and 4. Rivularia granulifera. — Fig. 2. Lithonema
calcareum. — Fig. 3. Lithonema crustaceum. —Figs. 5 and 6.
Oscillatoria lucifuga.
P L A T E L X V I.
Fig. 1. Stigonema atrovirens. — Figs. 2 and 3. Stigonema
mammillosum. — Figs. 4 and 5. Stigonema panniforme.
P L A T E L X V I I .
Figs. 1 and 2. Hassallia ocellata. — Figs. 3 and 4. Stigonema
minutum. — Fig. 5. Hassallia 9 bgssoidea. — Fig. 6.
Hassallia? limbata.
P L A T E L X V I I I .
Fig. 1. Scytonema Hibernicum.—Fig. 2. Scytonemamyochrous.
— Fig. 3. Hassallia compacta.— Figs. 4, 5. Tolypothrix?
Dillwynii. — Fig. 6. Petalonema alatum. — Fig. 7. A r-
thronema cirrhosum.
P L A T E L X IX .
Fig. 1. Calothrix mirabilis. — Fig. 2. Stigonema interruptum.
— Fig. 3, Tolypothrix punctata. — Fig. 4. Tolypothrix
distorta. — Fig. 6. Tolypothrix Berheleyana 9 — Fig. 6.
Tolypothrix nivea. — F ig. 7. Tolypothrix rufescens.