SPONGES Y3 
OnRnDE Aa MARINE SteIClOousS SPONGES. 
Skeleton present, composed either wholly of spicules of 
silica, or partly of silicious spicules and partly of horny fiber. 
Inhabit sea water. 
Oi OoPRESH OWACEER SluMChOUS 
SPONGES: 
Skeleton present, and composed largely of spicules of 
silica. Inhabit fresh water. 
ORO Ge Re ee PRS rie SON GES. 
Skeleton, wholly absent. Inhabit sea water. 
