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Fredericella sultana, attached to a stone. Natural size.
Portion of the same magnified.
Imperfect septum at commencement of a branch.
Extremity of a tentacle, much magnified, with the internal layer partly exposed by the removal of the external cellular layer.
Muscular fibre of F. Sultana, showing its striated structure, and its tendency to break into discs. The central fibre of the group is seen to be irregularly swollen, as it appears when in a state of contraction.
A very much enlarged drawing of the polypide and cell, to show anatomical details.