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Show 582 DR. R. VON LENDENFELD ON THE SYSTEMATIC [Dec. 21, 4. Familia CORTICID^E, Vosmaer. With candelabras. Corticium, Schmidt, and Thrombus, Sollas. 5. Familia PACHASTRELLID^E, Sollas. With simple tetracts, irregularly scattered. Pachastrella, Schmidt, Battersbya, Bowerbank, and Dercitus, Gray. ii. Subtribus Maerocamera?, nov. With large chambers. 6. Familia PLAKINID.E, F. E. Schulze. With scattered diact, triact, and tetract spicules. Plakina, Plakinastrella, and Plakorlis, F. E. Schulze, and Eupalax, Sollas. 7. Familia OsCARELLiDiE, Lendenfeld. Without spicules. Oscarella, Vosmaer. ii. Tribus Trianina, Sollas. The centres of the tetraxon spicules with one differentiated ray lie in the surface, in which the equal rays extend tangentially. 8. Familia GEODID^E, Sollas. A cortex of globate spicules. Chambers small, with small outlets. Eiylus, Gray ; Caminus, Schmidt; Cydonium, Midler ; Synops, Vosmaer ; Isops, Sollas; Geodia, Lamarck ; and Geodissa, Lendenfeld. 9. Familia STELLETTID^E, Sollas. With stellate flesh-spicules usually in the cortex. 1. Subfamilia Psammasterina, Sollas. With stellates and spined rods. Psammastra, Sollas. 2. Subfamilia Stryphnina, Sollas. With stellates and amphiastrellae. Stryphnus, Sollas. 3. Subfamilia Sanidasterina, Sollas. With stellate and sanidaster (?) spicules. Tribrachium, Weltner, and Tethyopsis, Stewart. 4. Subfamilia Stellettina, Sollas. With two kinds of stellate flesh-spicules. Antrastra, Draymastra, Sollas ; Stellette, Schmidt. 5. Subfamilia Homasterina, Sollas. With one kind of stellate flesh-spicules. Myriastra, Sollas ; Asterella, Sollas; Pilochrata, Sollas. |