File:EB1911 Hydromedusae - structure of Velella.jpg
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current | 17:50, 4 December 2018 | 971 × 1,418 (238 KB) | Bob Burkhardt | {{Information |description ={{en|1=Diagram of the structure of ''Velella'', showing the central and peripheral thirds of a half-section of the colony, the middle third being omitted. The ectoderm is indicated by close hatching, the endoderm by light hatching, the mesogloea by thick black lines, the horny skeleton of the pneumatophore and sail by dotting (see legend below).}} |date =published 1911 |source =“Hydromedusae,” ''Encyclopædia Britannica'' (11th ed.), v. 14, 1911, p... |
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