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DESCRIPTION OF THE PLATES.

PLATE I.
Cristatella Mucedo.

Fig.

1. Cristatella mucedo; an adult specimen, adhering to the submerged stem of Ranunculus

aquafilis. Of the natural size.

2. The same enlarged.

3. Statoblast of Cristatella mucedo in an early stage; it is surrounded by a ciliated mem

brane, and there is as yet no appearance of the marginal spines.

4. The same more advanced; the enveloping membrane is destitute of cilia, and the spines

have begun to grow out from the margin of the disc.

5. The same, still further advanced; the spines have impinged on the enveloping mem

brane.

6. The mature statoblast; the enveloping membrane has been torn by the pressure of the

spines, and has disappeared, and the statoblast has become free.

7. The same, viewed on the edge. Figs. 3—7 are magnified about 50 diameters.

8. Natural size of mature statoblast.

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