G. SPONGIA. 
155 
with a level surface, but irregularly creviced; fibres 
stiff, reticulated, and almost bare® 
Indian ocean. 
THICK-LOBED. 
15. Spongia crassiloba . Incrusting, with several 
upright lobes, which are thick and compressed, be- 
tween an oval and cone in form, but obtuse, having 
round holes upon the borders, irregularly ranged. 
TABULATED. 
16. Spongia tabula . Mass flat like a small plank; 
sides transversely and irregularly undulated, with 
holes on the summits of the risings ; texture fibrous, a 
little woolly, very porous, and slightly incrusted. 
Australasia. 
CAKE-FORMED. 
17. Spongia placenta . Form obliquely orbicular, 
and marked with rayed furrows ; texture firm and 
very porous, fibrous, and reticulated ; holes very few, 
and not large. 
Australasia ; King's Island. 
GAUZY. 
18. Spongia byssoides . Mass simple, sessile, and 
oblong, more or less swelled, spread upon marine 
bodies ; texture very loose, transparent, gauzy, and 
fibrous. 
Australasia. 
cushion. 
19. Spongia pulvinata. Sessile, oval, cushion-formed, 
and scantily lobed ; colour orange, and sometimes olive* 
Australasian seas. 
