428 H. James-Clark—The American Spongilla. 
vantage of not being obliged to destroy and sever parts of an 
organism from their natural relations. Premising thus, that 
everything has been studied “in place,” even to the details of 
the monads, we shall endeavor to describe this sponge as if it 
from the monadigerous mass (9), an were, suspen 
on the points of the larger, far-projecting spicules (e); just as a 
tent canvas is supported on the e The inner di- 
bracing them, as if ina sheath, from their tips to t 
where they rest on the brown mass of monads. In brief, we 
pillars are the bundles of spicules, and the floor is tapestried by 
Sse the pillars hangs from the ceil- 
which allow a free ingress of the water to the space just _be- 
neath. These are the afferent ostioles (os), through and into 
op ee the focus of the objective to the floor of arene 8 
, : : 
h). The outer divis- 
Ms scattered minute 
pe eae es ES 
