WIXO SHELLS. ROCK-DWELLERS ANT> A MUSSEL 



Great-winged Avicula, Avicula macroplcra. 



Atlantic Wing Shell. Avicula Allanlira. 



Peruvian Wing Shell, Avicula Peruviana with byssus. 



4 Rock-eater, Li ihodomus lithophagus, in its burrow. 



5 Rough Rock -dweller. Vulsella rugosa, embedded in porous rock. 



6 Tulip Horse Mussel, MoJiola tulipa. 



