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toriw, whose structure consists of a series of annuli enclosed
within a tube, at regular intervals. True articulated joints
are not found in the tribe Oscillatorince. From the genera
Oscillatoria and Lyngbya it differs in having the filaments
attached at one of their extremities, the other being free.
Fig. 1. C. luteola, on a small tuft o f Ectocarpus, natural size. Fig. 2. A portion
o f a filament o f Ectocarpus, with the Calothrix. Fig. 3. Portion o f a
filament o f the Calothrix; magnified.
H
