SPONGES | yt 
Calcateous or Limy Sponges, .Drn Lendenfeld’s classifica: 
tion ofthe minor groups among sponges is exceedingly 
complex and is founded mainly upon microscopical examin- 
ation of the cells, often regardless of the absence or pres: 
ence of spicules or horny fiber, thatis, sponges without 
skeletons are often grouped with others which have spic- 
wles or horny fiber. 
