BRITISH
F R E S H W A T E R ALGA] .
E X P L A N A T IO N OF T H E P L A T E S .
P L A T E I.
Fig. 1. Conferva rivularis. Spores killed by opium (magnified
340 times). — Fig. 2. Conf. glomerata. Spores killed
by iodine (magnified 500 times). Fig. 3. The same treated
with iodine and dried between two plates of glass (magnified
to the same extent). Fig. 4. The same beginning to
germinate (430 times). Fig. 5. Germination more advanced
(290 times). Fig. 6. Germination still more advanced.
— Fig. 7. Chcetophora? Spores killed by iodine. (This and
the following are magnified 340 times.) Fig. 8. The same,
treated with iodine. Fig. 9. Germination.— Fig. 10. Cha-
tophora elegans var. pisiformis. Spores killed by iodine.
Fig. 11. Germination.— Fig. 12. Prolifera rivularis. Spores
the ciliie of which are invisible by reason of the rapid
movement. (This and the following figures are magnified
341 times.) Fig. 13. The same,killed with iodine. Fig. 14.
The same, treated with iodine, and dried between two plates
of glass. Fig. 15. Germination. Figs. 16, 17. Germination
more advanced.—Fig. 18. Prolifer a Candollii. Spores killed
with weak iodine. Fig. 19. Germination.
P L A T E II.
Shows the reproduction of Vaucheria clavata. Fig. 20. The
extremity of one of the filaments previous to the condensation
of the contained endochrome. Fig. 21. The same,
A 3