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NATURAL HISTORY, TORONTO REGION
CHLOROPHYCEAE—Green Algae.

Order Confervales (Heterocontae). Family Botrydiaceae. Botrydium granulatum, Grev.* Don Valley.

Order Conjugales.

Family Desmidiaceae.

Fifty-six species are listed by Mackenzie—all from Ashbridge's Bay, High Park, Don Valley and Humber Valley. The genera represented are:—Hyalotheca (1 species), Desmidium (1), Penium (2), Closterium (12), Docidium (2), Calocylindrus (2), Cosmarium (19), Xanthidium (2), Arthrodesmus (1), Euastrum (2), Micrasterias (1), Staurastrum (11) .

Family Zygnemaceae.

Zygnema pectinatum, var. anomalum, girth. Spirogyra flavescens, Cleve.

"   longata, Kg.

"   nitida, Link. jugalis, Kg.

"   orthospira, Kg.

"   quadrata, Petit.

Family Mesocarpaceae. Mongeotia genuflexa, Agardh.

Order Volvocales.

Family Chlamydomonadaceae. Chlamydomonas—undetermined species. Haematococcus pluvialis, Agardh.

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