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Show 588 DR. R. VON LENDENFELD ON THE SYSTEMATIC [Dec. 21, Schulze; Cgscinoderma, Carter; Spongodendron, Lendenfeld; and many of the species of the genus Spongia, auctorum. 4. Subfamilia Spongissina?, Lendenfeld. With flesh-spicules. Spongissa, Lendenfeld, M S . 2. Familia APLYSINID^E, Lendenfeld. The skeleton is composed of spongin-tubes, the walls of which are thinner than the diameter of the lumen, which is filled with pith. 1. Subfamilia Aplysininos. Without flesh-spicules. Lufifaria, Duchassaing and Michelotti; Aplysina, Nardo; Luffa-rella, Lendenfeld, M S . ; Dendrospongia, Hyatt. 2. Subfamilia Aplysissina, Lendenfeld. With flesh-spicules. Aplysissa, Lendenfeld, M S . 3. Familia HIRCINID^E, Lendenfeld. With narrow axial canal in the fibres, and filaments in the ground-substance. 1. Subfamilia Hircinina?, Lendenfeld. Without proper spicules. Hircinia, Nardo ; Hircinopsis, Noclosina, Aphrotriche, and Sty-phlos, Lendenfeld, MS.; Stematonemia, Bowerbank; Filifera, Lie-berkiihn ; Sarcatragus, Schmidt; and Polytherses, Duchassaing and Michelotti. 2. Subfamilia Hircinissina?, Lendenfeld. With proper spicules. 1. Group Chalinocinia, nov. With proper spicules in the connecting fibres. Chalinocinia, Lendenfeld. 2. Group Hircinissa, nov. Without proper spicules in the fibres ; with flesh-spicules. Hircinissa, Lendenfeld, M S . ii. Tribus Macro c amer ce, Lendenfeld. With large sac-shaped ciliated chambers, and soft, transparent ground-substance. 4. Familia SPONGELID^E, Lendenfeld. The horny fibres contain slender axial thread and form a reticulated skeleton. |