clxvi 
THE VOYAGE OE H.M.S. CHALLENGER, 
By the last-described process we obtain entire and isolated desmas, somewhat 
corroded, but revealing the general form of the spicules with a completeness that leaves 
nothing to be desired ; the slides obtained by the other processes afford us the one set, 
all the loose spicules and young desmas, the latter of the first importance ; and the 
other the network with the desmas in their naturaf relations to each other. 
