P L A T E L X X X .
Eig. 1. Hcematococcus cryptophylla. — Fig. 2. Protococcus
nivalis. — Fig. 3. Hcematococcus Allmanni. — F ig. 4. Hcematococcus
Hookeriana. — Fig. 5. Palmella cruenta. —
Fig. 6. (a) (b) Hcematococcus insignis. — Fig. 7. Sorospora ?
yrumosa.
P L A T E L X X X L
Fig. 1. Hcematococcus frustulosus. — Fig. 2. Botrydina vulgaris.—
Y\g. 2>. Hcematococcus alpestris. — Fig. 4. Hcematococcus
murorum. — Fig. 5. Hcematococcus vulgaris. —
Fig. 6. Hcematococcus granosus.
P L A T E L X X X I I .
Fig. 1. Hcematococcus rupestris.—-Fig. 2. Hcematococcus li-
nalis. — Fig. 3. Hcematococcus ceruginosus. — F ig. 4. Hcematococcus
furfuraceus. — Fig. 5. Hcematococcus lividus.
— Fig. 6. Coccochloris protuberans of the natural size.
Figs. 7, 8, 9, 10. The same magnified in different degrees.
P L A T E L X X X I I I .
Fig. 1. Desmidium cylindricum. Fig. 2. End view of a cell
of the same. — Fig. 3. Glceoprium dissiliens. Fig. 4. End
view of a cell of the same. — Fig. 5. Glceoprium mucosum.
Fig. 6. End view of a cell o-f the same. — Fig. 7. Desmidium
Swartzii. Fig. 8. End view of a cell of the same. —
Fig. 9. Desmidium Borreri. Fig. 10. End view of the
same.—Figs. H a n d 12. Sphcerozosma elegans, (Very bad.)
P L A T E L X X X IV .
Fig. 3. Desmidium quadrangulatum : a, front view ; b, end
view ; c, two frustules of D. Swartzii for comparison.
— Fig. 1. Sphcerozosma elegans. — Fig. 2. Sphcerozosma
excavatum. — Fig. 4. Closterium Lunula. — Fig. 5. Clos-
tenum Diance. — Fig. 6. Merismopedia punctata. — F ig. 7.
Trigonocystis orbicularis : a, front view ; b, end view ;
c, showing the mode of formation of new segments.—Fig. 8.
Triyonocysfis mucronata: a, front view of different forms
of the species ; b, end view ; c, conjugated fronds with the
sporangium; d, state of the sporangium. — F ig. 9. Tri-
yonocystis muricata; a, front view; b, end view; e, empty
frond. — Fig. 10. Trigonocystis mnricata var. rugosa : a,
front view; b, end view. — Fig. 11. Trigonocystis tricornis:
a, front view ; b, end view; c, end view of empty frond.__
Fig. 12. Trigonocystis aculeata; a, front view; b, end
view ; c, end view of variety.
P L A T E L X X X V .
Fig. 1. Trigonocystis gracilis: a, front view ; b, c, end views.
— Fig. 2. Trigonocystis bifida; a, a, front views; b, end
view ; c, formation of new fronds. — Fig. 3. Staurastrum
paradoxum: a, front view ; b, end view ; c, new segment,
— F ig. 4. Staurastrum ? tetraceum : a, front view ; b, end
view; c, side view.— Fig. 5. Staurastrum dilatatum:
a, front view ; b, end view. — Fig. 6. Pentasterias Jenneri;
a, front view ; b, end view ; c, empty segment. — Fig. 7.
Pentasterias margaritaceum: front view; end views.
— Fig. 8. Pentasterias arachne : a, front view ; b, end view.
— Fig. 9. Arthrodesmus convergens: a, front view ; b, end
view. — F ig. 10. Arthrodesmus incus ; a, front view’ ; b, end
view. Fig. 11. Arthrodesmus octocornis: a, front view;
b, end view. ’
P L A T E L X X X V I .
Fig. 1. Cosmariummaryaritiferum.— P\g. 2. Cosmarium Bo-
tryhs. — Fig. 3. Cosmarium ornatum. — F ig. 4. Cosmarium
cylindricum. — Fig. 5. Cosmarium orbiculatum. — Fig. 6.
Cosmarium crenatum. — Pig. 7. Cosmarium Cucurbita. —
Figs. 8 and 9. Cosmarium ovale. — Fig. 10. Cosmarium
Cucumis. — Fig. 11. Cosmarium quadratum.— Fio-. 12.
Cosmarium quadratum, var. — Fig. 13. Pediastrum^Bory-
anum. —Fig. 14. Pediastrum anyulosum. — Figs. 15 and 16.
Pediastrum constrictum.— Fig. 17. Pediastrum tetras,__
B 2