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Spongia oculata, showing the orifices and currents outwards.
2. Anastomosing horny substance of Spongia communis.
3. Siliceous spiculum of S. papillaris.
4. Of Scineria.
5. S.Pasons
6. Calcareous spiculum of S. compressus.
7. Transverse section of a canal of S. papillaria, showing the structure of the ova passing along the cana.
8. Ovum of S.panicea seen laterally--the cilie anterior
9 The same seen on the end, with a circle produced by the ciliary action.
10. Young Spongia papilaris

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