with the endochrome slightly condensed. Fig. 22. The
extremity has hecome clavate, and the endochrome considerably
condensed, though still continuous with tha t of
the remainder of the filament. Fig. 23. A diaphragm is
formed between the endochrome contained in the clavate
extremity of the filament and that of the filament itself.
Fio-. 24. The spore is completely formed, and surrounded
by a transparent border. Fig. 25. The spore is represented
in the act of escaping from the ruptured extremity
of the filaments. Fig. 26. The extremity of the filament
subsequent to the escape of the spore. ^ Fig. 27. Spore
after its emission : it is enveloped in a g rW la r epispore:
the cilite are invisible; the colourless extremity is always in
advance. Fig. 28. The spore, the movements of which
have become retarded. Fig. 29. A spore, the movements
of which have been suddenly arrested in iodine water. The
cilia3 are distinguished on the margin short and fine, which
are the organs of locomotion. Fig. 30. Spore treated with
iodine and dried between two plates of glass; the cilia?
have become much more clear, and appear longer by reason
of the retraction of the epispore. Fig. 31. Spore preparing
to germinate; it has become globular; the colourless
portion is no longer to be distinguished, and the epispore
has disappeared. Figs. 32, 33. Germination. The extremities
of the newly formed filaments are colourless.
P L A T F I I I .
Fig. 1'. Vaucheria geminata. — Fig. 2. Vaucheria racemosa.
P L A T F IV.
Fig. 1. Vaucheria dichotoma. — Fig. 2. Vaucheria sessilis.
Fig. 3. Vaucheria Dilhvynii.
P L A T F V.
Fig. 1. Vaucheria hamata. — Fig. 2. Vaucheria terrestris. —
Fig. 3. Vaucheria ovoidea.
P L A T F VI.
Vaucheria ornithocephala. — Fig. 5. Vaucheria aversa.
Fig. 4
— Fig. 6. Vaucheria polysperma.— . Vaucheria repens.
P L A T F V II.
Figures of Lemam’« ioraZosa after Kiitzing. Fig. 1. Represents
the external cellular character of the filaments. Fig. 2.
Shows the internal, spherical, and loosely aggregated cells,
with some of the articulated sporules resting upon them.
Figs. 3, 4, and 5. Exhibit the arrangement of the beaded
and articulated spores within the inflated portions of the
filaments. Figs. 6 and 12. The branched spores separated
from the filament. Fig. 7. The same more highly magnified.
Figs. 8, 9, 10, and 11. Germinating spores.
P L A T E V III.
Figs. 1, 2. Bangia fusco-purpurea. The first figure represents
the species in its young condition, in which the
endochrome of the cells is homogeneous, and the second the
species in its fully developed form ; the endochrome having
become granular or parcelled out into zoospores. — Fig. 3.
Trentepohlia pulchella. — Fig. 4. Lyngbya prolifica.
P L A T E IX .
Figs. 1 and 2. Chatophora endiavifolia. The former in its
natural size, the latter magnified. — Figs. 3 and 4. Chaito-
phora elegans. — Figs. 5 and 6. Cheetophora pisiformis.
The latter figure copied from Berkeley, and exhibiting the
very rare capsular fructification. — Figs. 7 and 8. Chmto-
phora tuberculosa. The latter figure after K iitzing, showing
its capsular fructification.
P L A T E X.
Fig. 3. D ra p a rna ld ia elon g a ta . — V\g.4^. D ra p a rn a ld ia nana.
P L A T E X I.
Fig. 1. D ra p a rn a ld ia condensata.— V ig . 2. D ra p a rn a ld ia tenuis.
A 4