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The works of Francis Maitland Balfour, Volume 2 (of 4)

Note 72 — Chapter VI

Reading edition

I. HYDROZOA.

1. Hydromedusæ.

Hydroidea.

Trachymedusæ.

2. Siphonophora.

Calycophoridæ.

Physophoridæ.

3. Acraspeda.

II. ACTINOZOA.

1. Alcyonaria.

(Octocoralla.)

2. Zoantharia.

(Hexacoralla.)

III. CTENOPHORA.

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