WIXG SHELLS, ROCK-DWELLERS ANT) A ^rUSSEL 



1 Great-winged Avicula. Avicula macmplcra. 4 



2 Atlantic Wing Siiell, Avicula Atlanlica. 5 



3 Peruvian \\'ing Shell, Avicula Peruvijna with byssus. 6 



Rock-eater, Liihodomiis Hlhophag'us, in itshuno-w. 



Rough Rock-dweller. VulsrUa rugosa, embedded in porous rock. 



Tulip Horse Mussel, Modiola tulipa. 



