Order 1. Mtxospongia.— Gelatinous; no skeleton: Halisarca. 
Order 2. Fibbospongia.— With fibrous skeleton • \ horuy: s v°naia. 
( siliceous: Jmpiectella. 
Order 3. Caloispongia. —Skeleton calcareous, not fibrous: Sycon. 
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