FOSSIL SPONGES, ETC. 9 



solid bodies, called fibres and spicules. The latter 

 are of a variety of shapes, from the most simple to 



Fig. 8. 



Fig. 9. 



Figs. 5-9. Fossil Sponge Spicules, from Blackdown and Haldon, all drawn on the 

 "i to r?'oD tn of an inch. (After H. J. Carter.) 



sea)', o 



the most complex, but they are interwoven so closely 

 together that when the sponge is dead and its " flesh " 



