The porifera and coelentera . A. B 14. A, yerticilUtes anastomans, yVSint. (After Zittel.) B, Pttrostroma Schulzci, Dixl.(After Doderleiii.) may be very small as compared with the horizontal extent, until inextreme cases the sponge becomes a mere crust, spread over thesurface to which it is attached, and rising slightly in the region ofthe osculum. On the other hand, the sponge may become sub- SPONGES

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