. Fig. 19. A. Caberea boryi (Aud.). Great Barrier Reef Expedition, St. XII. Vibracular setae cut short. B. C. boryi (Aud.). Ghardaqa, Red Sea. C, D. C. helicina Port Phillip. C. Young colony with ancestrula. D. Part of the first zooecium from Fig. C more highly magnified. Transverse bar underlying scutum shown by dotted line. a. ancestrula, cr. crenulated edge of crypto- cyst, marginal avicularium, o. ovicell, v. vibraculum.

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