BLACK MUREX from the Gulf of California, off 

 La Paz, Phyllonotus radix, furnishes a secretion 

 from which natives make purple dye. 



■'o^fjg^^ 



LACKING A SHELL of its own, this grotesque 

 creature, Hypoconcha panamensis, has its 

 fourth and fifth legs modified to hold half a bi- 

 valve shell on its back for protection. 



BURROWING PIDDOCKS secrete a solvent which enables them to bore smooth holes into 

 solid rock, coralline formations, or the thick shells of mollusks, affording them protection 

 from numerous animals, chiefly starfishes. 



Ill 



