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Show 1886.] POSITION A N D CLASSIFICATION OF SPONGES. 589 1. Subfamilia Spongelince, Lendenfeld. Without flesh-spicules. The skeleton consists of distinct horny fibre containing a varying amount of foreign matter. Spongelia, Nardo; Dysidea, Johnston ; and Reteplax, Lendenfeld, M S . 2. Subfamilia Psammina?, nov. The skeleton consists of foreign bodies cemented by spongin, which, however, is not distinctly visible; without flesh-spicules. Psammapemma, Marshall; Psammella, Lendenfeld, M S . ; and Holopsamma, Carter. 3. Subfamilia Spongelissina, Lendenfeld. The skeleton is composed of distinct horny fibres containing foreign bodies. With flesh-spicules. Dysideissa, Lendenfeld, M S . 4. Subfamilia Psammopessina?, nov. The skeleton consists of cemented foreign bodies without distinct horny fibres. With flesh-spicules. Psammopessa, Lendenfeld, M S . ; Phoriosponyia, Marshall; and Haastia, Lendenfeld, M S . 5. Familia APLYSILLID^E, Lendenfeld. The skeleton consists of spongin-tubes ramified in a dendritic fashion and filled with pith. 1. Subfamilia Aplysillina?, Lendenfeld. Cells are found in the pith of the fibres only. Darwinella, Fritz Miiller ; Aplysilla, F. E. Schulze ; Verongia, Bowerbank; and Deudrilla, Lendenfeld. 2. Subfamilia Ianthellince, nov. Cells are found in the spongin-sheath of the fibre. Ianthella, Gray. 6. Familia HALISARCID^E, Vosmaer. Without skeleton. Halisarca, Schmidt, and Bajalus, Lendenfeld. V. KEY TO THE RECENT FAMILIES OF SPONGES. n f Skeletou calcareous 1. \ N o calcareous skeleton (2.) C Entoderm consists exclusively of collar-cells ... 3. 1. \ Entoderm consists of collar- and pavement- ' cells (4.) (Mesoderm thin, gastral cavity irregular 1. Asconidce. Mesoderm thin, radial cylindrical chambers ... 2. Homodermidce. Mesoderm thick, irregular chambers 3. Leucopsidce. |