1. 
   Grantia
   Grantia is a genus of calcareous sponges belonging to the family Grantiidae. Grantias contain spicules and spongin fibers. ...
   Found op http://en.wikipedia.org/wiki/Grantia
   
   
2. 
   Grantia
   The grantia is a member of the calcarea class.
   Found op http://www.probertencyclopaedia.com/browse/BGA.HTM
   
   
3. 
   grantia
   1) Member of the calcarea class
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/grantia/1
   
   

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