46 



BIVALVES. 



MYTILUS. 



fixes itself to other bodies, by means of its silky byssus; 

 and is found in immense beds or layers, consisting of 

 many myriads; 



The Mytilus Cygneus and Anatinus, (both fresh-water 

 species), frequently become the food of ducks and crows; 

 the latter of which, when they find the shell too hard, 

 mount with it into the air, andthen letting it fall, they 

 pick out the fish from the broken shelL 



The Indian, Atlantic, American, and Northern oceans, 

 produce many species ; some are also from New Zealand, 

 the Red, Mediterranean^ and Russian seasi 



