STROMBS AND MUEEX SHELLS. 

 MUREX SHELLS. 



199 



Murex and its relatives are marine, and prey upon 

 other mollusks. The Spiny Murex of the Moluccas, 

 the Pyrula and Tritonium of the coast of the United 



Fig. 365. — Scorpion Shell, or Pteroceras. Much reduced. 

 Chinese Seas. 



Fig. 367. — Stromb, or Conch. 

 Much reduced. West Indies. 



Fig. 366. — Aporrhais. 

 Coast of New England. 



States, and the Frog Shell of Australia, are some of 

 the principal ones. The ancients obtained the Tyrian 

 purple dye from the Murex gasteropods. 



