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Ordo III. Keratosa. 
-Subord. 1. Solid non spiculate kerato-fibrous sceletons. 
Gen. Spongeia L. Sceleton kerato-fibrous. Fibres solid, ey- 
lindrical, aspieulous. Rete unsymmetrical. Zahlreiche Arten, unter 
denen Sp. officmalis L. 
.Gen. n. Spongionella. Sceleton kerato-fibrous. Fibres 
solid, eylindrical, aspieulous. Rete symmetrical; primary fibres ra- 
diating from, the base to the -apex. Secondary fibres disposed at 
nearly- right angles to the primary ones. Type: Sp. pulchella So- 
werby. (Cacospongia scalaris Schm. ?) 
Subord. 2. Solid semispiculate kerato-fibrous sceletons. 
Gen. Halispongia Bl. Sceleton kerato-fibrous. Fibres solid; 
primary fibres compressed, containing an irregularly disposed series 
of spicula, Secondary series of fibres unsymmetrical, cylindrical, 
without spicula. Zahlreiche Arten aus Australien.und dem mittel- 
ländischen Meere. (Wohl identisch mit Spongelia Schmidt — aller- 
dings nur in der Voraussetzung, dass die Kieselspicula der dieken 
Fasern fremde Einschlüsse sind.) 
"Subord. 3. Solid, intirely spieulate, kerato-fibrous sceletons. 
Gen. Chalina Grant. Sceleton fibrous. Fibres keratose, solid, 
eylindrical and interspieulate. Rete symmetrical; primary lines 
radiating. from the’basal or axial parts of the sponge to the distal 
portions. Secondary lines of fibre at about right angles to the pri- 
mary ones. Unter den zahlreichen brittischen Arten wird als Typus 
bezeichnet: Halich. oculata Johnst. (ob wirklich zu den Hornschwäm- 
men gehörig ? Vielleicht mit Clathria Schm. identisch.) 
Subord. 4. Simple fistulo-kerato-Abrous sceletons. 
Gen. Verongia Bow. Sceleton kerato-fibrous. Fibres cylin- 
drieal, continuously fistulosi (d. h. von einem Achsenkanale durch- 
setzt), aspieulous. Rete unsymmetrical. Type: Sp. fistulosa Lam. 
Subord. 5. Compound fistulo-fibrous sceletons (d.h. mit Fa- 
sern, die von einem complicirten Canalsystem durchzogen sind). 
‚Gen. Auliskia Bow. Sceleton kerato-fibrous. Fibres aspiculous, 
eylindrical, continuously fistulose; primary fistulae having minute 
caecoid canals radiating from them in every direction. Rete unsym- 
metrical. (In der Voraussetzung, dass das Canalsystem der Fasern 
von Parasiten herrührt, wohl identisch mit Aplysina Schm.) 
Subord. 6. Regular semi-areno-fibrous sceleton. 
Gen. Stematumenia Bow. Primary fibres of the sceleton so- 
lid, more or less compressed, containing a central axial line of 
spieula and grains of extraneous matters. Interstitial structure ab- 
undantly fibro-membranous. (Wohl mit Hireinia Nardo identisch.) 
Subord. 7. . Irregular and entirely areno-fibrous sceletons.' Mit, 
