SPICULES OF GRANTI NIVEA. 209 



Grantia compressa is an abundant animal in the caves at 

 Tenby, and the Gouliot Caves in Serk. Grantia ciliata is 

 found in rocky pools hanging like a little bottle with a circle 

 of silvery spiculse round its mouth. 



Spicules of Pachymatisma (crutches). 

 Halichondria incrustans. 

 Griinthsia. 

 Dysidea fragilis. 

 Tethese. 



Spongillae fluviatilis. 

 Geodia. 

 Sponge Spicules, Thames. 



,> Serk. 



Pin-shaped. 



Parallel-spined. 



Anchor-shaped. 



Truncated. 



Clubs. 



Stars. 



Sponges from the Phillipine Islands. 



14, 



