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"Portion of a colony of Corallium rubrum, showing expanded and contracted zooids. In the lower part of the figure the cortex has been cut away to show the axis, ax, and the longitudinal canals, lc, surrounding it." — The Encyclopedia Britannica, 1910

Corallium Rubrum

"Portion of a colony of Corallium rubrum, showing expanded and contracted zooids. In the lower part…

"Portion of a colony of <em>Corallium rubrum</em>, showing expanded and contracted zooids. In the lower part of the figure the cortex has been cut away to show the axis, ax, and the longitudinal canals, lc, surrounding it." &mdash;Encyclopedia Britannica, 1910

Colony of Collarium Rubrum

"Portion of a colony of Corallium rubrum, showing expanded and contracted zooids. In the lower…

"Spirillum Rubrum, Esmarsch." &mdash; The Encyclopedia Britannica, 1910

Spirillum Rubrum

"Spirillum Rubrum, Esmarsch." — The Encyclopedia Britannica, 1910

"Spirillum Rubrum, Esmarsch." &mdash; The Encyclopedia Britannica, 1910

Spirillum Rubrum

"Spirillum Rubrum, Esmarsch." — The Encyclopedia Britannica, 1910