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PLATE IX.

FREDERICELLA SULTANA.

Fig. 1. Fredericella sultana, attached to a stone. Natural size. 2. Portion of the same magnified. 3. Imperfect septum at commencement of a branch. 4. Statoblast. 5. Extremity of a tentacle, much magnified, with the internal layer partly exposed by the

removal of the external cellular layer. 6. 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 ap

pears when in a state of contraction. 7. A very much enlarged drawing of the polypide and cell, to show anatomical details.

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PLATE X.

PALUDICELLA EHRENBERGI.

Fig. 1. Paludicella Ehrenbergi, attached to a submerged stone. Natural size. 2. A portion of the same magnified. 3. A very much enlarged drawing of a cell with the polypide retracted; showing the

anatomical details. 4. A cell seen in section with the polypide exserted, and exhibiting anatomical details. The

ovary and testis are here fully developed, while in fig. 3 they are represented in an

undeveloped state. 5. Lophophore viewed upon the upper surface, with the mouth, and roots of the tentacula.

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